Lensrentals Repair Data: 2012-2013

Published August 6, 2013

Correction: Lenses called “Rokinon” in the “Weeks to Failure” rate incorrectly included Bower & Samyang branded products. Because of this error, data for lenses called “Rokinon” lenses has been removed. We apologize for this inaccuracy, and any confusion that may have resulted therefrom.

What Is This?

We have a unique opportunity: We own a very large number of lenses and cameras subjected to rather harsh conditions. Basically, we have a laboratory set up to stress test photography equipment and we share those results with you.

Our numbers reflect heavy and hard use. Your personal equipment shouldn’t fail nearly as often; it isn’t subjected to rental conditions. But this does provide some comparison about how fragile various pieces of equipment are.

It’s not completely scientific, but with data on over 12,000 copies resulting in over 2,000 repairs it’s a bit more useful than posts on a forum going back and forth between “mine’s great” and “mine sucked.”

This list is not a comment about how good a lens is. It’s simply data about how often it breaks under harsh conditions. Some of my favorite lenses and cameras are rather fragile.

Some Things to be Aware of

First of all this is our largest survey ever. This is a full year’s data (the last report was for 6 months) and we have a lot more lenses and cameras than we used to have, going out on a lot more rentals. A larger sample size helps improve data accuracy, and this sample is more than twice as large as any we’ve done previously.

We present our data as the number of rental weeks per failure. That levels the playing field since nothing (as best we can tell) stops working while sitting on a shelf. For example, if we had 100 copies of a lens, each rented for 30 weeks during the year, and we’ve had 30 repairs, that lens averages 100 rental weeks per failure.

Equipment Age

Our average item is less than a year old, and none are more than two years old. For the vast majority of items the average copy is just under a year old.

But if an item has been released in the last 8 or 9 months, all the copies are new and repairs may seem falsely low. They may also seem falsely high – a problem that was noticed with the first production run may be quietly fixed before subsequent production runs. For example, the battery doors on the first batch of Nikon D800 cameras broke if you looked at them hard, but we’ve not seen that at all since the first 6 months.

When an item is discontinued we still stock it for a while, so all of the copies are nearly two years old and the repair rate may get higher. This year the Canon 24-70 f/2.8 and 5D Mk IIs are good examples of discontinued items where the fleet is older. This may also happen to a lesser extent when demand drops. For example Nikon D600 and D800 demand has dropped compared to last year, so we haven’t added many new copies and the fleet average for those cameras is over a year old.

The Failure Rate Is Higher This Year

How we do this survey is always a work in progress. I made one major change between last year’s survey and this year’s. I call more repairs ‘failures’ and fewer ‘damage’. Damaged items don’t count for this survey, so if a lens is dropped and dented, while it goes to repair we don’t count it as a failure.

But I noticed something while looking at our data. We’ve always considered a broken AF/MF switch, for example, to be damage. That makes sense, part of the lens is broken off. But when I took 31 broken AF/MF switches out of the repair spreadsheet and moved them to the ‘damaged’ side, I noticed that 14 of them were from one lens; the Canon 35mm f/1.4L. That means almost half of the AF/MF switch replacements were done on a lens that accounts for 1% of all of our copies.

I found a lot of similar examples. Lots of lenses get dropped (our customers email and tell us). Most are absolutely fine afterwards. With a few, though, every time a copy gets bumped the zoom key jumps out of its slot, elements shift and the optical resolutions changes, and the barrel breaks in half.

So I decided, by the power vested in me as keeper of the spreadsheets, that it made more sense to consider ‘indirect damage’ to be more about fragile lenses and less about minor drops and bumps. Obviously, front or rear element scratches, sand or water in the lens, dented filter rings and broken hoods are direct damage and don’t count in our numbers. Everything else is now a repair.

New Lenses are Now Repaired, Not Returned

Last year, if a lens had a problem ‘out of the box’ we sent it in for exchange and it didn’t show up on the repair list. This year, we sent it in for repair (there were business reasons for that). This increased the repair rate, too. (When you buy 5,000 or so lenses a year, that 3% out-of-the-box problem rate means another 150 repairs.)

I also counted repeat repairs as separate repairs this year. If a lens went in to repair, came back not fixed, and went back again it counted as two repairs (last year it would have been one). I did this thinking if it was your lens, you would definitely consider it two repairs. I also thought if a company was worse at getting things fixed the first time, our data should reflect it somehow.

Because of these changes, the failure rate was nearly twice as high as last year. Last year’s report cut off ‘high failure rate’ at less than 155 rental weeks per failure. This year it’s 60 rental weeks per failure. It also means you can’t compare a lens’ weeks-until-failure rate from last year to this year and say “it got worse”, because almost every lens got worse. On the other hand, if one got better, it really did get better.

Equipment Failure Rates

Limitations and Disclaimers

This is an annualized repair rate of the period from July 1, 2012 to July 1, 2013. We list the 5% of our inventory that had the highest repair rate (fewest rental weeks per failure).


Unlike some manufacturers, we consider failure of an internal part without obvious external damage to be a failure, not the result of impact. 


We make no comment at all on lenses that we have less than 10 copies of (that’s not enough data to be useful) or that have been in stock less than 3 months — unless something spectacular is going on.

The following lenses or cameras we carry were NOT evaluated because we have less than 10 copies or they were in stock less than 3 months.

  • Canon: 180 f/3.5 L; MPE-65 Macro; 800mm f/5.6 IS L; 200-400 f/4 IS L; 400mm DO IS
  • Nikon: 14mm f/2.8; 16mm f/2.8; 20mm f/2.8; 200mm f/2.0 VR; all PC-E lenses
  • Sony: all Alpha prime lenses; NEX 20mm f/2.8; NEX30mm f/3.5 macro; NEXOSS; 55-210;
  • Tamron: 180 f/3.5
  • Sigma: 20 f/1.8; 70mm f/2.8 Macro; 105mm macro; 180 f/2.8 OS; 300-80mm
  • Panasonic: All cameras except GH2, 45-175mm lens, 100-300 lens
  • Olympus m4/3: 9-18mm
  • All Leica, Pentax, Fuji, and Schneider items


If we carry the lens and it isn’t listed above or below, then its weeks per failure was greater than 60 weeks.

I used the following descriptions of the sample size: Very large – over 3,000 rental weeks and 200 copies; Large – over 1,000 rental weeks and 90 copies; Moderate – over 400 rental weeks and 40 copies; Small – under 400 rental weeks, 10 to 40 copies. The larger the data sample, the more reliable the results. Small samples sizes are more likely to just be random events.

We’ll look a little further into those by telling you what it was that went wrong. If 4 different things go wrong in 4 different lenses out of 50 in stock, it’s likely to be random. If all 4 have exactly the same problem, it’s more likely there is a weakness in the lens.

The average rental weeks per failure for all lenses and cameras this year was just over 100 . Everything fails eventually, but it usually takes a long time to do it.

Finally, the usual ‘don’t read this and lose your mind‘ caveat applies: These are heavily used, frequently shipped lenses. A lens owned by someone who uses it on weekends, takes good care of it, and doesn’t ship it around the country would have a much lower failure rate.

Lenses with High Failure Rates

First, let’s give you an idea of how well things last in general. I screened over 350 lenses for failure rates. The distribution by rental weeks per failure is shown in the table below (It’s not a bell curve because I lumped all the long-term survivors into the category > 140 weeks). Overall I find it pretty impressive how well lenses hold up under harsh conditions.


The 19 photography lenses with repair rates more frequent than every 60 weeks are listed below.

LensWeeks to FailureSample SizeCommon Problems
Tamron 17-50 f/2.8 VC37SmallOptics (4), Focus jam (3), Zoom jam (2), VR
Sony 18-200 OSS LE37SmallZoom jam (4), electronics (3)
Nikon 70-200 f/2.8 VR II39LargeZoom jam (16), Optics (15), tripod footplate (8)
Nikon 14-24 f/2.840LargeZoom jam (17), Optics (3), Aperture (2)
Sigma 70-200 f/2.8 OS40
SmallMotor (3), OS unit (2), Optics (2)
Sigma 50-500 OS41ModerateMotor (3), OS unit (3), zoom (3), optics (3)
Canon 14mm f/2.8 II41LargeOptics (11), focus assembly (2)
Tamron 24-70 f/2.8 VC42Moderatefocus jam (4), Optics (2), VC (2)
Canon 70-200 f/2.8 IS II42Very LargeOptics (29), IS (7) , loose barrel (7), zoom jam (6)
Sigma 120-300 OS45SmallAF Motor (3), OS system (2)
Canon 70-200 f/4 IS51ModerateOptics (5), electrical (2)
Sony 70-200 f/2.851SmallAF motor (4)
Canon 24-70 f/2.8 58Very LargeOptics (21), Zoom jam (3), focus jam (2)
Tokina 11-16 f/2.8 II58ModerateAF/MF Clutch (6), loose barrel (5), AF motor (2), Diaphragm (1)


To give you some perspective, I’ve included a table of video items we carry, because generally video gear is more fragile than photo gear (and probably gets abused more). The first two items are two of our highest repair video items, the CP.2 lenses are our most durable item, the rest just a couple of random picks I was interested in.

Item Weeks to Failure Sample Size Common problems
Cooke Panchro Cine Lens6SmallFocus cams break (6)
Sony FS 7U camcorder26ModerateBroken viewfinder (4), Broken handle (3), Loose LCD (3)
Manfrotto 504 HD fluid head47ModerateLeg locks (6), pan spring (4)
Black Magic Camcorder60ModerateBroken SSD reader assembly (5)
Zeiss CP.2 lenses140+LargeOptics (2). focus (2)



You may have noticed no cameras made the list this year, which is a good thing. The highest repair rate camera was the Nikon D800 (65 weeks to repair), mostly because of autofocus problems. Nothing else was less than 80 weeks to repair. I should mention that part of the reason is I didn’t include some common problems as repairs: the D700‘s peeling grips, D600’s dust issues, and buttons popping off of the OM-D  I didn’t consider failure since most people will take care of them at home. Even if I did include those things, though, those cameras would still not have made the list.

However, some common problems we saw a year ago like the 5D Mk III having bent CF pins and the D800 battery doors snapping off seem to have been fixed and have ceased to be an issue at all. Camera bodies, both SLR and mirrorless, had the lowest repair rates we’ve seen in 5 years.

Removed From the List

Off the list this year are the Canon 35mm f/1.4 and 100-400 IS; Nikon 105 f/2.8 VR Micro and 16-35m f/4 VR; and Tokina 16-26 f/2.8. For completeness I’ll mention that the Canon and Nikons above were barely off, all of them in the 60-70 weeks to repair range. The Tokina did seem to be better this year, with nearly 90 weeks per repair.

A Few Observations

Several other lenses on the list have small sample sizes, so there is more concern that they may just be a random event – just a few less repairs and they wouldn’t be here. I think that may be true for the Tamron 17-50 f/2.8 VC – it hasn’t been here before and there seem to be several different problems going on. The Sony 18-200 OSS LE is a new lens that has already had one recall. Since many of it’s problems were electronic I suspect it’s something that will be fixed before next year’s report.

The other small sample-size lenses are here every year, for the same problems, so I do think they really are fragile lenses.

Other conclusions I think are valid:

  • Every manufacturer has some great lenses and some weak lenses.
  • 70-200 f/2.8 lenses are likely to fail no matter who makes them. We think of them as ‘built like tanks’ because they have that heavy, all-metal case. That case, though, is as packed with mechanics and electronics as anything you’ve ever seen. There’s a LOT of stuff in there that has to work perfectly. Inevitably, some of that stuff breaks.
  • Sigma’s big zooms still have trouble with their HSM motors and OS units, but Sigma really does seem to be doing better. Their large zoom lenses are still on the list but the frequency is lower than it used to be, in a year when my new accounting system made most numbers look worse. Sigma’s prime lenses and smaller zooms have excellent repair rates.

The insides of 70-200 lenses are densely packed with working parts. 

The Most Reliable Lenses

I get asked every year to name the most reliable lenses, but I decline. There are two reasons. First, the repair curve is rather one-tailed – we have outliers that get repaired a lot, but because we sell everything at two years of age, there is a huge glop of lenses with low repair rates. I can give you a simple generalization, though: If you want to buy a lens that will last decades, then you want a completely mechanical prime lens.

It’s just logic. Electronic components get hot, or moist, and eventually capacitors leak or solders break.



Zoom mechanisms move a lot and eventually the components supporting the zooming elements wear out. (Focus elements move too, but not as much and generally with a lot smaller mass.

All focusing motors will fail eventually. They are electronic and they move.

An IS unit is electronic, has a motor, and moves hundreds of times a second.

All of that being said, do I want an autofocus lens that zooms and has a stabilized image? Yes, I do. But the simple reality is the more complex a lens is, the more likely it is going to be to fail someday. It is no coincidence that the lenses that last 120+ weeks at Lensrentals are generally primes without image stabilization, and the ones that frequent the most repaired list are usually zooms with image stabilization.

I’ll pause a second here for those of you who don’t believe in the laws of physics to say, “Well, my IS zoom has lasted 10 years without a problem.” That’s cool; statistics suggest many IS autofocus zooms will last 10 years if you’re careful with them.

But if we look at large numbers the failure rate will be higher for zooms than primes, for lenses with IS than lenses without it, and even for autofocus lenses than for manual focus lenses. I’m not certain about mechanical versus electronic apertures – we see similar numbers of failures in both.

Factory Service Center Report

I care about this a more than most of you, probably, since I send things in for repair every single day while many of you have never sent anything in for repair. But someday you will need a repair, trust me on that.

Remember that service varies greatly geographically. We are U.S. only; service is very different in Europe, Asia, even Canada. The data below is only pertinent to you if you live in the U. S.

In general, factory service got better in late 2012 and 2013. I suspect widespread consumer complaining, particularly about Nikon USA, accounts for some of that. I know that some companies began looking at service as an opportunity to enhance their own reputation. Tamron announce with their ‘3 day guarantee repair’ turnaround time and Sigma an enhanced ‘commitment to quality assurance’ program. Nikon started to sell some consumer replaceable parts on their website.

Turnaround Time

Repair turnaround time had a few changes compared to last year. Olympus had some disarray this year. (In case you weren’t aware, Olympus suddenly closed their repair center and for several weeks no one knew where anything was, or even where you could send a repair.) Their average turnaround time is higher because several items were gone for several months during the chaos, but even if I took those away they still would be the slowest by a good margin.
Sony made a huge improvement compared to last year, dropping from around 30 days on average to 12. Nikon actually is improving more than it appears at first glance. Repair turnaround time has decreased from nearly 30 days in late 2012, to around 20 days now. Most of the other Factory Service Centers stayed about the same.
I didn’t list Leica because they don’t really have a U. S. repair center; most things have to go to Germany. Their turnaround time is leisurely at nearly 35 days, but this includes shipping, reshipping, customs clearance, etc.


Repair Costs 

Repair costs went up just a bit this year, but not anything like the sudden jump we saw in early 2012.



Tokina is absent from the table because we stopped sending anything in to them years ago. If we can’t fix it ourselves, we use an independent service center. They may be much better now, but I have no information either way.

Before you start dancing a jig about your brand’s low repair costs or complaining about its high costs, remember that repairs are generally a flat, tiered rate based on the item’s sale price. That means for a $500 lens, a basic repair is probably $80-$100, while for a $2,000 lens the basic repair is likely $200-$225.  When you consider mirrorless gear generally costs a lot less than SLR gear and third-party lenses cost less than brand-name lenses, it should be obvious some of the price difference in this graph is just from that.

Obviously, the 4 companies with the highest repair prices are repairing the most expensive equipment. From a purely ‘price of equipment’ standpoint, Panasonic, Sigma, Tamron, and Olympus are about the same, while Sony fits in between the two groups (which is expected given it’s mixture of equipment).

One thing I’ve started seeing that I really don’t like: some companies (Sony particularly) have started charging a nonrefundable repair estimate fee. If you send your lens in with a scratched element and decide after seeing the $600 replacement cost that you’ll just live with it, it can cost you $135 to get your lens back.  This is something you want to check before you send an item in for repair (unless you know it’s so totally broken you’d throw it away if it can’t be fixed).

One reason I really don’t like this is simple: even a non-working lens or camera is worth something sold for parts (check eBay – some things go for more than half the new price when sold as ‘not working, for parts only’). If anything, the company should be paying you for keeping your ‘not repairable’ item. I guarantee you they aren’t throwing it away.

The other reason I don’t like it is it’s cheating. If you call and ask the replacement costs for  a 16-350mm Bazooma front element, they usually tell you we have to look at before we can give you a quote, even though it’s a flat-rate fee. So basically they’re saying, “it will cost you $135 for us to tell you how much the charge is.” I can understand needing to see the lens before deciding the fee for more complex things, of course.

I will point out that this year I didn’t even consider sensor replacements in figuring repair costs because we’ve simply stopped replacing scratched and damaged sensors. At $1,000 to $1,800 for a full-frame sensor replacement, it doesn’t make economic sense anymore; we either convert the cameras to infrared or part them out. I mention this because I’ve always said, “learn how to clean your own sensor.” I’m getting hesitant to say that to someone who’s never done it before. Scratching a sensor during cleaning is rare, but nowadays it’s a devastating expense if it does happen.

Battery & Chargers

I didn’t include this in the main part of the article, because honestly I think it might be us — simply because I haven’t heard much about it in any online forums. When I looked at replacement parts we’ve purchased this year one thing really jumped out at me: battery chargers.

We have several hundred battery chargers, obviously. When they break, we buy a replacement charger. For chargers in general, we replace about 2% per year. With two exceptions. All smaller Nikon chargers (MH-18a, MH-22, MH-24, MH-25, MH-26, and Mh-27) are replaced at a rate of 14% to 16% per year. All Fuji chargers (BC45W, BC50, BC65N) are replaced at a rate of 17% to 21% per year. No other charger is over 2%.

Since I haven’t seen anyone complaining about this online, I have to consider it’s something we do. My first thought is that we ‘top off’ batteries constantly. A battery comes back from rental with 2/3 of a charge, but we fully charge it before sending it out. This isn’t what most people do at home. So it may be those chargers get stressed somehow by our topping them off day-in and day-out. The other brand’s chargers might have some circuitry that isn’t bothered by that.

But any of you have other suggestions, please let me know and help me figure this one out.


ADDENDUM!!  Looking at the list and saying “Canon has the highest repair rate because they have the most lenses on the list” is pretty silly. We carry far more Canon lenses than any other brand. So they would be expected to have far more lenses in the ‘high repair’ list. The fact that they don’t dominate the list actually indicates they have a lower repair rate (they do, slightly, but it’s certainly not significantly lower). 

Looking at things statistically (as best as can be done) there really isn’t a significant difference either by all lenses, or by fraction of lenses with higher repair rates between any of the brands.  There are some slight overall differences in repair rate by brand but none that seem statistically significant, or even close to it. 

 I repeat, every brand has some fragile lenses. If you must Fanboy go ahead. But don’t start your comment with “Roger Said” ’cause Roger didn’t.


Roger Cicala

August, 2013


Author: Roger Cicala

I’m Roger and I am the founder of Hailed as one of the optic nerds here, I enjoy shooting collimated light through 30X microscope objectives in my spare time. When I do take real pictures I like using something different: a Medium format, or Pentax K1, or a Sony RX1R.

Posted in Equipment
  • Jaye

    Hi Roger,

    To be more precise, can I use the canon 70-200 ii lens as a MF lens if the AF fails? How about the 24-70 ii as well, can it be used as a MF lens if the AF fails. There shouldn’t be a problem right? Since these 2 lenses are not focus by wire design. I’m quite concerned as I use these 2 lenses extensively for my assignments, now hearing that the 70-200 ii has reliability issues, I’m afraid that the lens will fail on me mid shoot. So I was wondering if the electronics were to fail, can I still use it or I might need a backup lens. Do you also happen to know how long canon will continue to service a lens after it has been discontinued.


  • Roger Cicala

    Neal, there’s not many recommendations I’d make on the basis of reliability – I want lenses with good optics. A 70-200 f/2.8 IS II is a great lens. I’d definitely buy one for my 5DIII if I shot in that focal range even though it has a higher chance of needing a repair. If money was no object, I’d absolutely want a 24-70 f/2.8 Mk II also.

    At the wider end I’d consider primes, though, simply because I don’t love the 16-35 or 17-40 Canon zooms.

  • Roger Cicala

    Andy, unfortunately I can’t give out exact number of copies we own, rental frequencies, etc. We’re a market leader in a competitive business and the number of each item we have at different times of the year is information our competitors would dearly love to have. Even things like what repairs we can do in-house is nondisclosure – knowing which items we can fix tells a competitor they can learn to fix those too, while knowing what we can’t fix saves them hundreds of hours learning they can’t fix it either. There’s actually some very good arguments made by management here that I give out far more information than I should already – a smart competitor (and we have a lot of competitors we respect, because they’re smart) learns a lot about us from this article already.


  • Neal Spero

    Another great article.I am a zoom person. i own a 5d mark 111. I have all older zooms .which of the newer zooms would you recommend?.

  • Andy

    Could you post the raw data so that we could do our own analysis of the data?

  • Roger Cicala


    That’s often, but not always, true with IS units: turn them off and the lens works fine otherwise. AF motors vary but most of the time if the AF motor has failed manual focus doesn’t work properly (some MF systems focus through the AF motor) or the lens gives an error message. Some can still be used as an MF lens though.

  • Jaye

    Hi Roger,

    Just a quick question. Let’s say if the electronic part of the lenses fail, for eg: the IS unit or the AF fails. Can the lenses still work? If I turn the IS off and use it in Manual Focus, does it still work flawlessly thought without the aid of the electronics.


  • Nqina Dlamini

    Great data represantation. Great article, truly enjoyed it.

  • Roger Cicala


    That does sound right (maybe right isn’t the correct word, but certainly ‘not unusual’). We’ve seen the up-down tilt change noise both from AF and from the IS unit. A certain % of them have noisier IS units and they don’t seem more likely to develop problems than others. I do know there are several areas where barrels ‘barely touch’ in that lens at certain distances, and there are also gears, rather than just helicoid units with the zoom mechanism.

    So, while the noise makes everyone (us included) a bit concerned, I can say that our evidence is exactly what Canon said: it doesn’t seem to be any real problem, just a noise.


  • Steven


    Appreciate your kind help with everything! I do have one final question (last one, I promise!) about the 70-200 II… As stated previously, mine had the AF/MF slipping and Canon replaced the main barrel assembly and adjusted the USM collar or something… When I got the lens back, the slipping issue was fixed but it still returns a bit more slowly one way than the other when the focus ring is turned and the lens pointed upward.

    But my other issue is when I got the lens back I had a rubbing noise at MFD when the lens hunts for focus. Always makes this scrape noise each time when it hits that MFD point. If you tilt the lens sideways at all, the noise goes away… And changes if you point it up/down. I sent the lens back in and they called me today saying it is not abnormal with this type of barrel/USM design on the 70-200 II and other super-tele’s… That there are two collars or barrels inside the lens that may contact or something at the extremes of the focus range, but will not cause any issue or effect performance at all.

    They said the USM tested flawlessly and speeds and accuracy were both excellent.

    Anyway, they basically told me they can loosen the collars to suppress the noise or even replace the USM, but they said it is working perfectly and may not fix the noise I am hearing. Found this strange, but curious on your two cents… I told them to do whatever they felt was needed (or not needed) as long as it wont give me problems later on. I was told their lead tech was going to look over the lens again and make sure all functions and everything were fine before shipping back to me again.

    Does this sound right to you about the faint “rubbing/scraping” noise I am hearing at the MFD end of the focus range? I have had a few of these lenses and never heard this before, but they are pretty confident with me that it is non-issue due to the design of the lenses internal focusing and such.

    Thanks again Roger!

  • Nick

    Thanks Roger for the insight on the 70-200’s as well. We just recently also discovered a weirdissue with the new Sigma 120-300. If kept relatively level, one of our copies has a tendency to have the AF disengage if turned too fast past the min distance or past infinity.

    Once disengaged the AF fails and turning the manual focus ring does nothing. Tilting the lens slightly up or down resolves this problem instantly though, just thought I’d share 🙂

  • Omer Einav

    Great Work Roger thanks for taking the time to share this info with us !

  • j. hamann

    I never saw 70-300mm L IS. It has USM and IS and never appear in the list. Probably New generation lenses has better durability. 70-200mm L 2.8 and 100-400mm L almost always in the list from the IS, autofocus, or zooming failure.

  • Roger Cicala

    Mark, all of our lenses get tagged with bar codes as soon as we purchase them. That’s actually what we track in the system (although for most lenses the bar code pulls up their serial number).

  • Mark

    As far as I know Rokinon lenses carry no serial numbers – so how do you track specific lenses, e.g. for repeat failures / lemons / batch issues?

    Incidentally Samyang lenses do have serial numbers (observed as I have several of each brand).

  • Mass

    Thanks Roger for these stats. I love the stats on repair time, they are damning for some manufacturers.

  • L.P.O.

    thank you so much for your answer regarding the 50/1.4. So, in this case common wisdom seems to correlate with your experiences. Nice.
    The personal reason I asked the question was that the Canon 50/1.4 is the only lens I’ve ever broken (yes, USM AF/MF). I treat my lenses not with utmost care, but pretty gently. That lens never saw a proper bump, still it broke.
    I’ve also taken to heart the Rokinon warning(s) your list contains. I have the excellent 14/2.8 under the name of Samyang, and will be very careful with it so as not to lose it. Because I for sure love the image quality!

  • Markus

    Interesting to read that you regard electronics more prone to failure than mechanics. I always thought that everybody would move to more electronic parts because they are more compact, cheaper and more reliable.

  • Roger said, “…I think a true statistical analysis would require a nonparametric analysis [and] I don’t want to do those anymore”.

    Couldn’t agree more, wouldn’t want to suggest that you do! But what I mentioned was standard deviation and standard error, that is, some measure of variability. Heck, a range could do as well, something that accompanies each mean that you calculate, just an extra cell that reports STDEV(A1:A123)/SQRT(COUNT(A1:A123)) or whatever for every AVERAGE(A1:A123)… Then (us) statistically-minded folk would be able to figure it out from there (smile)!

  • Roger Cicala

    LPO the 50 f/1.4 is always near the list and always for USM motor failures, but never quite on it. I suspect the fact that non of ours are more than 2 years old helps that lens more than some.

  • A

    I’m wondering whether the power supply issues are related to the different voltages and frequencies of mains power around the world?

    Nick’s post hints that I might be on the right track; Singapore (where I believe he is) is a 240V/50Hz country, but the USA a 110V/60Hz country.

    As a matter of interest, are the failing power supplies labelled as international supplies (i.e. 110V-240V 50/60Hz), or are they purely 110V/60Hz?

    The very cheapest power supplies are often single voltage; so it could be that they’re just the cheapest PSUs available – which would suggest they’re slightly marginal in the first place. Cheapest rarely means best designed and best quality 😉

    I know with appliances using AC motors that the motors work best at their designed frequency, and may burn out prematurely if used at a different frequency, even if the voltage is otherwise the same. There’s an outside chance that that’s what’s going on – they’re 50Hz transformers being near the limits and are a bit outside their tolerances when running on 60Hz.

    Or it could be completely unrelated, and just be that a bad batch went through 😉

    Incidentally Japan has probably the oddest power supply in the world – they use 100V (and are nearly unique in doing so), and they’re also nearly unique in having different halves of the country on different supply frequencies. The eastern side is on 50Hz, whilst the western side on 60Hz.

  • L.P.O.

    Can’t help but ask: does Canon’s 50/1.4 lie somewhere on the map? My understanding is that the Micro USM AF mechanism of that lens is particularly brittle and it gets lots of complaints in discussion forums. How does it look to you?

  • Roger Cicala


    We’ve seen that exact thing a few times. I think it’s always been a tension adjustment in the USM motor when it happens, but it hasn’t been as frequent as some of the other issues. I think we’ve seen it 3 or 4 times.


  • Steve


    One final question in regards to the Canon 70-200 II… Have you had many USM issues with any of the 70-200’s from Canon? I got another copy recently, used, and when pointed upward the USM slips. If you turn the focus ring one way, the focusing elements slip and don’t move. If you turn the other way, they move fine. Looked it up and seen quite a few other people with the same issue on youtube and forums, but notice no USM/focusing issues listed in your 70-200 repairs. Have you seen this before? And what causes this to happen with the USM? Mine currently is being repaired by Canon, thankfully!

    Thanks again for all the wonderful insight, Roger.

  • I own Canon Cameras and mostly Tamron Lenses.
    I have a Love/Hate relationship with Canon Repair. They are either fantastic, or horrible. But the turnaround time, including shipping is always less than a week.
    On the Tamron side, AMAZING Service. Turnaround time is always less than a week. And, with a 6 year warranty, I have only had to pay for one repair.
    I have a 28-75mm f/2.8 that I dropped and broke 8 months into ownership. They charged me $180 and replaced 2 elements and the focus assembly. It came back in 6 days and worked better than new.
    With most companies that’s it for the warranty, or they only give you 30-60 days. But Tamron continued the 6 year warranty.
    It has since been back twice and each time they end up replacing an element or 2 and some electronics. I sent it back 1 month before the warranty ran out, just to get a firmware update and, well, because they always do an excellent job of cleaning it and I’m finally selling it for an upgrade. They replaced 2 elements, and the focus assembly (again). It works so well on my new 6D I don’t want to sell it for an upgrade!

  • Roger Cicala

    Chris, there is a difference with the f/2.8 zooms generally failing a bit more, although the difference isn’t huge. I’m not sure of the reason. Useage, weight of components, momentum being larger when they get banged around (which might mean shipping is a culprit) are all possibilities and I’m sure there are others.

  • Chris

    Hi Roger, am I correct in thinking from reading your reply to Rondhoi and the post etc that in general the F2.8 zooms tend to fail more frequently than the F4 zooms and slower? If so what would be your thoughts on why? More complexity in achieving F2.8? More built in correction for element alignment? Or other factors such as the uses they are put to and who by?

  • Roger Cicala

    Nick, we used to see a fair number of zoom failures in the 120-300s, but that seems to not be much of an issue anymore. The AF/OS failures, though, are fairly constant. Inside the lens there’s one unit that contains the AF motor and OS unit – I suspect rather than disassemble that, for most repairs they just replace the entire thing (much quicker) and it comes back with AF / OS unit replaced.

    Our Nikon 70-200s have two optical problems pretty regularly: front element decentering and a rear element that ‘pops out’ of the molded retaining clip that holds it in place. In both cases center sharpness remains good – the corners get soft. I think a lot of people don’t notice it because with that lens they’re usually working with centered subjects.


  • Roger Cicala

    We haven’t noticed it to the degree we have with the 24-70 – we get a number of 8-15 scratches but lenses with ‘bugeye’ front elements have some tendency to do that. Plus we only have a few dozen 8-15s compared to a hundreds of 24-70 IIs.


  • Steve


    Interesting you mention the 24-70 II scratching easily. I sent mine to Canon for fine hairline scratches on the inside and outside of the front element. They replaced it no problem under warranty. I noticed the new element has a tiny mark on the bottom about 1mm long and I think I only ever touched the glass once before putting a filter on. Never ever marked a lens before this one.

    I also rented a 8-15 from Canon and seen it has similar coating scratches. Have you noticed other lenses with the flourine coating more scratched up?

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