Finally, the Nikon Z 24-70mm f/2.8 S Lens Teardown

Published January 15, 2020

Just so you know, my original title was “Lens Disassembly is a Complicated Profession. Don’t You Agree?” The editor said nobody would know what the post was about. But I promise, you’ll see by the end of this; lens disassembly is a complicated profession.

We were interested in this disassembly, and by interested, I mean both excited and nervous. We assumed that things would be very different inside from previous Nikon lenses. But Nikon lenses have always been a bit ‘old fashioned’ and different from other SLR lenses, so we weren’t sure what to expect., 2020

Do not get your lens and screwdriver and follow along at home. Bad things might happen. Bad. Things.

Before we start, a quick break to do some QA bitching. Nikon, do something about the felt you line the lens hoods with. It’s a really minor thing, and yeah, we can super glue it back down, but this is too frequent., 2020

Spoiler alert: we don’t find much else to complain about in this lens.

So Let’s Get Inside the Nikon Z 24-70mm f/2.8

Going in from the back, we start by removing the usual three tiny screws that hold the rear baffle in place., 2020


The baffle is felt-lined, whether for absorbing light or dust, or both, we don’t know. But it’s a nice touch., 2020


The bayonet is held in place by the usual four screws. Even after removing the screws, it took a little force to pull it off, almost a suction-like effect., 2020


We immediately saw the reason for this; the rear baffle has an inner lip that sits tight against the rear barrel. This might be to keep the bayonet centered, for a dust seal, to provide a little extra strength, or just because it looks cool. But after seeing it (I don’t remember anyone else that has it), it just seems like an all-around good idea. I certainly can’t think of any downside to it., 2020

There’s the usual rubber weather sealing ring under the bayonet., 2020

With the bayonet off, we see the PCB, and it’s flex connections., 2020

You may have noticed the spacing shims in the above photograph; there are three different sizes in this copy, so definitely, these are an adjustment, probably for infinity focus., 2020

Removing four more screws and one flex lets us remove the rear outer barrel., 2020

The flex goes to the A/M switch. The lens control ring is simply an optical sensor ring., 2020

Of course, there is a good, foamed weather seal at each barrel joint., 2020

The lens control barrel isn’t attached mechanically, so these two barrels can be separated., 2020

You could see the weather sealing in the above image, but this one also shows the ESD (electrostatic discharge) cushions that are under this ring., 2020

We can also see the optical sensor that is activated when you turn the control ring., 2020


OK, let’s take a moment for me to give some props. Forever, during Nikon tear-downs, I’ve made snarky comments about the old-fashioned look they have inside; soldered wires here and there, flexes wandering aimlessly, random secondary circuit boards, etc. Well, no more. Look at this engineering right here: neat flexes running directly where they’re heading placed in recessed channels in the barrel and thoroughly taped in place. Superb!, 2020

Nikon has clearly modernized and spent time and effort in making a clean, well-engineered layout for the electronics. I’ve been asking for that for years, and Nikon delivered. It would be a shame if, having gotten what I wanted, it ended up biting me in the ax, wouldn’t it? (I read this article about being a better writer, and it said to use foreshadowing. There you go, I foreshadowed the hell out of that, didn’t I?)

But I digress. The next step is undoing all the flexes and removing the PCB. If you compare this to the PCB in the Canon RF 70-200 f/2.8 you’ll probably notice there’s just less stuff on the Nikon PCB. We’re used to Nikon lenses having secondary circuit boards deeper in the lens and thought that was why. I’ll jump ahead and tell you there wasn’t another board, though, so Nikon probably does more electronic processing in the camera. (This was going to be more foreshadowing, except I ended up not talking about it anymore.), 2020

With the PCB off, we can see there are shims under the rear group (they’re the thin brass line). These are circular, so they’re for proper spacing, not tilt., 2020

There’s another light baffle back here, which is always a good thing., 2020

We moved on to taking off the mid barrel, removing the screws that obviously held it in place., 2020

And here, as happens so many times, we ran into the ‘be careful what you wish for; you might get it’ conundrum. As I’ve wished for dozens of times, Nikon has now made a neatly engineered lens with flexes laid out logically. They went even further, building in nice channels for the flexes and thoroughly taping each flex in its proper place.

One of those flexes (the one sticking up on the left) runs down to the display unit in this barrel. We untaped it where we could reach it, but it was still taped down somewhere underneath that ring. Aaron could feel the tug when he started to pull up the barrel., 2020

Rule 63 of taking apart lenses is ‘thou shalt not tug a flex’; because tearing a flex is bad. On Nikon lenses, because we can’t buy parts, tearing a flex is very bad.

We used every type of flat instrument we had to free the flex up, from spunger to bamboo sliver, but the tug remained the same., 2020

We even removed the rubber and the underlying shield tape to see if we could get a look from the other side., 2020, 2020

Tape is probably an inadequate description; that’s a nice piece of 0.5mm heavy-duty plastic. Despite all this, the bottom line is 45 minutes later, we still hadn’t gotten the display barrel off and couldn’t see where the flex was stuck. This is why we don’t do videos of teardowns; they’d be incredibly dull.

Many of you know my attention span is limited, so I suggested we inject alcohol into that area to loosen the adhesive and then pull the ring off, or let her rip, whichever happened. It’s been years since we damaged a lens during a disassembly. We were concerned that streak was about to end, but it was getting close to lunchtime, and we were hungry., 2020

The ring came off with no damage to the flex, and now we could see why it stuck; we could free up the part that went straight down, but after we lost sight of it, the flex had two right-angle turns, both of which were taped down. However, those two bends took all the direct tension off of the flex during removal, so there was actually little danger of tearing it., 2020


While we were looking around, though, we did see that there was a nice adjustable eccentric collar under the display ring. It has a very nice touch; the zero position is marked on it. You don’t care, I know, but for people working on the lens ‘zero mark at 12 degrees forward’ is a lot more accurate than ‘the fatty part is towards the front a bit’. It makes us sound all professional and such. After that flex fiasco, we need to sound more professional than ‘put some alcohol up in there and give it a tug’., 2020


A look underneath the display ring shows you the button on the ring, just a rubber stopper that pushes the real button underneath, which allows more complete weather sealing. To the left of the buttons, the gray plate is an anti-reflective/antiglare plate that was under the actual display. Finally, you’ll notice there’s a lot of yellow tape. This decorating theme is carried throughout the disassembly and gives the lens a bright, beachy feel (yeah, I been watching HGTV some). As we’ll discuss in a bit, this tape has a really practical purpose., 2020

The zoom barrel is next up. There are mechanical zoom stops (the two slotted screws) that are nice and robust, and again, good weather sealing between each outer barrel., 2020

Turning the lens a bit, you can see the zoom position sensor (Nikon has finally moved on from metal brushes) and one of the zoom ring keys (small slotted screw with white nylon collar) that attach the zoom ring to the cam barrel., 2020


All of those things are removed next to take the zoom barrel off. The zoom keys are heavy-duty, as you’d expect. Aaron here exhibits the ‘balance screw-on blade of screwdriver maneuver.’ This is the Geek equivalent of spinning a basketball on your fingertip. We’re like the Harlem Globetrotters of lens disassembly., 2020

With the hardware out, the zoom ring slides right off. We’ll look fondly back on this step, because ‘slides right off’ isn’t going to happen much more., 2020

Underneath the ring is the ESD pads that we got a peak of earlier., 2020


The next step is to unhook the flexes and sensors at this level. As you can see from the image above, Nikon puts actual connectors in the flex runs that can be disconnected; we much prefer that rather than long runs of a single flex that has to be traced and untaped.

The electronic zoom sensor is held in place by a couple of screws (already removed in this image)., 2020

This is a self-contained unit. On the backside is a small cam that inserts into a barrel slot. Rotating the zoom barrel moves the cam up and down, and the sensor reads that position., 2020

With all of that stuff disconnected, the next step is obviously to remove the inner (white) electronics barrel., 2020

Except, well, it wouldn’t slide off despite Aaron spending 30 minutes doing various zoom and focusing ring position changes. It was like watching a safecracker trying to find the right combination and failing. We just couldn’t remove the rear inner barrel.

As I mentioned earlier, I am not a patient man. My suggestion of ‘get a saw’ was overruled, and instead, we took a lunch break to regroup. To put it in perspective, lunch is usually between disassembly and reassembly. Here it was lunch break, and we weren’t even halfway done with disassembly.

After lunch, we did a reverse and decided to take out the front extending barrel. Like the Canon RF lens, the Nikon uses pairs of rollers, two in each slot. This should prevent any barrel sag in the extended position. The hardware isn’t as robust as Canon’s, but certainly seems adequate for the job., 2020

With those removed and a few more things detached, we were able to slide rear inner barrels off as a unit., 2020

So basically, you have to remove most of the front barrel hardware to take off the focus ring and rear barrel. We discussed the various reasons this would be so and concluded, “make Roger and Aaron look foolish during a tear down” was the most logical.

I’ll take a moment to discuss that pretty yellow tape we’ve seen scattered about the lens. It was about now we realized that the tape was placed inside of every screw hole in the lens, and its reason became apparent. It’s for what we refer to as FELD (First Expensive Lens is Dusty) syndrome. That’s where buyers of expensive lenses look inside, see dust, and lose their mind because they think lenses are assembled in NASA clean rooms, and ‘weather-resistant’ means ‘hermetically sealed like a vacuum jar.’, 2020

But even I admit they have a point when a brand-new lens gets a huge spec inside. The answer to ‘how did a huge spec get in there’ is generally Loctite. All the screws have Loctite to hold them in place, but extra dried Loctite can break off and become that ‘huge’ chunk of dust in the lens. (Huge usually equals about 0.1mm to 0.2mm; but lenses, as we learned in grade school, make things look bigger.) That yellow tape everywhere prevents any Loctite around the screws from getting down into the optical parts of the lens. Nicely done, Nikon. Very nicely done.

Another nice touch is Nikon has put line-up markings throughout the lens so that during reassembly, you know precisely how round pieces are supposed to line up. (If you haven’t done a reassembly, I should mention that most pieces will fit in any of 3 different rotations. That’s why you see us putting little marks on them during disassembly.), 2020

With the barrel off, we can now see those screws and collars we removed insert into nice brass inserts, no screwing into the plastic., 2020


There is also a second set of screws holding the front barrel on to the inner assemblies. The triangle just above the screw is another lineup marker., 2020

Removing these screws let us slide the extending barrel off., 2020

Inside, you can again see that yellow tape covering the internal opening of all the screw holes., 2020

Even the insides of the pressed in brass screw slots are taped., 2020

There is already some bad news about the front barrel, but to decide how bad we need to take the front element out. As seems to be the norm for this lens, we spent some time in quiet contemplation.  (Quiet Contemplation, of course, means softly muttering unlikely descriptions of the possible parentage of this lens.) We saw no screws; we saw no makeup ring that might cover screws, we just saw nothing., 2020

Finally, Aaron found an almost invisible seam that indicated a possible makeup ring and using the rarely required thumbnail tool was able to remove it. That revealed the spanner slots in the front element, so it just unscrews from its seating. Props again, though, because being unable to see the seems is an indication of how precisely even these decorative parts are being made., 2020


Now, here’s the bad news. If you notice what Aaron is holding in his right hand below, it’s one piece. So if you break off the filter ring or hood slots, this is the disassembly that has to be done to replace it. When a lens is designed to be repairable, the filter/hood ring is a separate part, and you take out three screws and replace it in 10 minutes. For this lens, replacing a broken filter ring means a major disassembly to replace the front barrel. It will not be cheap. It will not be at all cheap., 2020

The inner optical barrel is pretty nicely exposed now. This contains all of the optical elements other than the front, the focusing motors, aperture assembly, and of course, the cams and barrels for the zoom elements. You can see one of the eccentric collars showing through one of the zoom slots and a fair number of screws and collars for the inner elements., 2020


Rotating the barrel shows the focusing range. Note the rear element poking out in the image below, and the distance the rear element cam screw has traveled compared to the image above., 2020


The logical next step is to remove the second group, which is not an adjustable element. Each of three long screws is removed., 2020

Then a puller is used to remove each collar., 2020

After which, the second group slides out of the barrel., 2020

And then gets set in a safe place. Some new coatings are used on these elements, so we’re avoiding touching; some coatings are more delicate than others., 2020


Going back to the optical barrel, we get to see something we don’t see this well very often – the working of a secondary aperture. A fixed aperture zoom has to change the absolute aperture size as the focal length changes. At 70mm f/2.8 requires a 25mm aperture, at 24mm f/2.8 requires an 8.6mm aperture.

The Nikon does this mechanically. As you can see in the images below, as you move the zoom back from 70mm, the secondary aperture closes. (Note: like the rest of this disassembly, we were wrong about this being a secondary aperture, as you’ll see later.), 2020

The mechanism is simple and elegant (although a bit hard to see). There’s a cam that inserts into the zoom barrel, changing the size of this secondary aperture as you zoom. You can’t see it from the image, but the post is eccentric, it would be adjusted during assembly to fine-tune the aperture size accurately., 2020

The next obvious move was to take off the rear element. The posts removed quickly., 2020

After the second one was removed, it became apparent there was some mysterious force pushing the element up. This isn’t Aaron’s first rodeo, and he kept a good grip on the rear element as he removed the final post. You can see the force, at least one of them, inside the barrel in the image below., 2020

There is a set of three springs keeping separation force between the rear element and the main focusing element., 2020


The springs sit about 1/3 of their length in fairly deep wells in the back of the focusing element., 2020


And shallower wells in the rear group. Why springs, you ask? I don’t know. It is the way.  Notice again the yellow tape placed beneath every screw hole. Very thorough., 2020


Here’s a look from inside at the travel of the focusing group., 2020


Now we’ll move on to the next episode of “Roger and Aaron make bad choices.” We still have a couple of helicoid barrels, focusing and zoom lens groups, at least one adjustable group, the aperture, and the focusing motors in a fairly compact piece that needs to be disassembled., 2020

The focusing group is right there at the back of the lens, held in place with collars and screws, so that was the obvious choice., 2020, 2020

Except we discovered that once it was fully released and free in the back of the barrel, the focusing group won’t fit through the rear of the lens barrel., 2020

Now there will be a 20-minute break while Aaron replaced collars while holding the group, so it didn’t fall forward and bang into stuff. Once that’s done, we went back around to the front. Avoiding the adjustable collar was high on our list of goals, and there seemed to be a set of 6 screws and collars that would let us take something out of the front. (We couldn’t see exactly what was going to come out at this point, but we were comfortable something would. I mean, it got in there somehow, and somehow wasn’t through the back.), 2020

You know shit’s getting real when Aaron puts on gloves. He’s a wizard at doing all this without ever touching the glass, but sometimes he doubts his own abilities., 2020


We had made better choices this time, mostly because we had already exhausted all the bad choices (a metaphor for my life, really).  The zoom group came right out, complete with some compression springs and the untouched adjustment collars., 2020

This includes the aperture assembly we’d seen earlier., 2020


Now that it is removed, we can see it’s not a secondary aperture with the electronic aperture behind, as we thought earlier. This is the main aperture and a combination electrical/mechanical device. As we saw earlier from the top, there’s a cam that goes into the zoom ring, mechanically closing the aperture as you zoom to maintain f/2.8.

Here’s a good shot of the adjustable collar for the mechanical aperture function (top center). This would be adjusted using an ‘occulter’ (basically a sized target) so the aperture is the proper diameter. There is also an electronic aperture control inside that makes the aperture even smaller if you stop the lens down — very elegant piece of engineering., 2020

This assembly is basically two parts with three compression springs pulling the aperture assembly (in the front) towards the zoom element (in the rear). Since each of these two parts has it’s own cams (the forceps are in the forward cam hole) we aren’t certain if the spring is there to provide better feel during zooming (unlikely), to provide pull on the mechanical aperture when un-zooming (possible), or for some reason we don’t understand (almost certainly)., 2020


Now we go back, again remove the cams from the focusing group, and take it out through the front of the inner barrel., 2020

The inner barrel is now empty, other than a few cams and the various flexes passing hither and yon., 2020


The focusing group is self-contained. The rear view of the assembly shows just the backplate and the four screws holding it together., 2020

The front view showed the paired stepper motors that move the focusing group, and the two flexes that power them., 2020

Here’s a side view of one of the motors along with a position sensor., 2020

As you can tell from the screws over the motors and on the backplate, this unit can be further disassembled. But we didn’t see what more information we’d obtain, and this disassembly had already been one of the longest ever. Entirely our fault, now that we know the right way in it could be done in a couple of hours, tops. But it had been a long day nonetheless.

So long, in fact, that Aaron left things out to put back together tomorrow., 2020


As you can probably tell from our struggles doing this disassembly, the Nikon Z lenses are very different than their legacy lenses. They’re also different than what we’ve seen from other manufacturers. That suggests Nikon Z lenses, like Canon R lenses, are a completely new optomechanical design, probably done entirely in-house.

The engineering itself is incredible in most ways. The neatly laid out and solidly adhered flexes reflect the careful design. The taping of every possible point that Loctite or anything else could get in the lens does, too. The design is logical and clean; the difficulties in the tear-down were ours. Now that we know our way around, disassembly won’t be bad at all.

I will complain about the fact that filter-ring or hood-slot damage means an expensive repair. That was not well thought out; those are common repairs, and they’re going to be pricey on this lens. But the lens is well-engineered, and I see no other weak points to make me think it will be anything less than reliable.

I’m sure various internet experts have strong opinions about stepper motors versus electromagnetic motors versus piezo motors for linear focusing. I don’t have enough knowledge to comment other than the vague general understanding that EM is probably the fastest and stepper perhaps more accurate. I would simply caution people that taking engineering reports of how well a given motor does this or that may not be very well reflected in how a lens performs autofocus. Autofocus, like lens disassembly, is a complicated profession.

Roger Cicala and Aaron Closz

January 2020

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
  • Brandon Dube

    The lens would be a fundamentally different design if the F/# changed as a function of focal length. You can’t predict at all what would happen to the barrel or anything else.

  • Henry Winokur

    I find this a fascinating article, and I appreciate the work that you and Aaron did in taking the lens apart and putting it back together. I love taking things apart. i just wish I could put them back together again, so that they functioned! 🙂

    There is one small error in the spelling, when you are discussing the fact that sometimes people will see flecks of Loctite inside the lens: “But even I admit they have a point when a brand-new lens gets a huge spec inside. The answer to ‘how did a huge spec get in there’ is generally Loctite.” “Spec” is the abbreviation of “specification”. The word you were actually seeking is “speck”. That threw me for a serious loop when I first read it until I came to realize what was meant! 🙁

    Keep up the great work. As someone else said: you greatly underestimate your work at both doing the physical labor and writing about it.

  • Ben Langlotz ?????

    The taping of holes to prevent incursion of loctite crumbs is also a smart way to reduce the need for factory service that would be more complex (and cost-unfriendly if not under warranty). Much like the adoption of LED light in cars substantially reduces warranty bulb-replacement costs.

  • Jim Huang

    *Lens disassemble correctly is hard.????

  • Michael – Visual Pursuit

    Constant aperture is basically a historic and/or studio strobe thing.
    You don’t want your image brightness to change with focal length.

  • I collect old lenses and get a lot of grief about how useless my hobby is. So it was fun for me to tell everyone “I told you this would come in handy some day.” 🙂

  • PhilK

    I’m not an optical engineer so I cannot verify the specific numbers.

    All I know is that no lens designer is going to over-design a lens that is only required to open up to 2.8 at the wide end in such a way that the optics and barrel would allow acceptable IQ and vignetting characteristics even if the aperture is allowed to open to f0.96 at the wide end. (Or whatever actual wider opening that works out to be)

    It would be like putting a 500 bhp motor on a skateboard. Pointlessly expensive, large, heavy, and has no practical positive impact in actual real-world usage.

  • Michael

    Well, 2 times I tried to disassemble a lens:
    Canon EF-S 60mm 2.8. Stripped my screwdriver head.
    Learned about JIS screwdrivers. So I bought a JIS screwdriver set.
    Canon EF 85mm 1.2 L II: Stripped the screw completely. 1 of 3 screws were glued on, and the screw felt awfully brittle. I guess I’m keeping this lens for life. I just wanted to blow some dust out of the back element.

    Lens disassembly is hard.

  • Eamon Hickey

    Ah, yes, good example; I had forgotten about the Leica zooms. And I used the SL 24-90 ƒ/2.8-4 for several months—definitely a very top-tier zoom. Can’t believe I forgot it; the mind fades …

  • Akvinat

    24-70mm f/2.8 should have 70/2.8=25mm pupil size. If it stays the same as you zoom out – that would be 24/0.96=25mm. Lens that doesn’t stop down its aperture at all would be f/0.96 at the wide end. And f/2.0 – f/2.8 24-70mm zoom would be stopped down more than 2 stops at the wide end – perhaps enough, as it was shown by Samsung. Am I making a mistake in this calculation?

  • Akvinat

    Leica stil makes top-tier variable aperture zooms. I suppose they’re not afraid to look different…

  • Dimy

    It may also be dedicated to videographers who do want everything else to be constant while changing one parameter of a lens. E.g. parfocal, no focus breathing, no aperture focus shift, color matching…

  • Athanasius Kirchner

    That was amazing, and very kind of you. You just saved me a chunk of money ?
    I’d guess that a lot of older, fully mechanical zooms work the same way, as it sounds cheaper and easier.

  • I guess it could happen, but we see Kapon tape inside lenses and cameras maintain its stickiness for years and years.

  • I actually have one on the shelf, this made me take it down and look: it has the aperture very close to the rear, so as Brandon pointed out above it maintains a constant aperture that way.

    It was interesting, looking from the front you see the entrance pupil vary as you zoom it, from the back, of course, you just see the fixed aperture (it appears from looking the aperture is must in front of the rearmost singlet).

  • Athanasius Kirchner

    If you can cough the $$$ for a new, electronically coupled bayonet mount for their optical bench, I’m sure Roger would be delighted to oblige ?

    PS: It’s a LOT of money.

  • Athanasius Kirchner

    Ahh, I get it now. Thanks a lot for your input, as always.

  • Athanasius Kirchner

    “We’re like the Harlem Globetrotters of lens disassembly.”

    You both underestimate and overestimate yourselves, I think. But I split my sides laughing at that reference!

  • Athanasius Kirchner

    I suddenly feel a strong urge to purchase a Voigtländer Zoomar, to see if it also stopped down automatically or not. It was the first of the type, after all.

  • Athanasius Kirchner

    Thank you for answering the age-old question. I’d much rather love it if they let *me* decide where my own threshold for “useless mush” is, and give me the extra speed.

  • Larry, very occasionally we’ll have an issue and have to repeat disassembly to figure out what we did wrong. Once or twice a year. Usually it’s something simple like a flex wasn’t plugged in properly.

  • Larry Huck

    Your ability to perform this lens teardown and reassembly is amazing. Way beyond my abilities!
    I am wondering how often you put a complex lens completely back together and it doesn’t work correctly?

  • PhilK

    Still kind of weird to use motors that don’t operate on the native voltages you provide from the camera, especially for a brand-new system like RF where you are in control of all those design parameters.

    And even more so because Canon is a top maker of micro-motors, with lots of motor patents. it’s not like they couldn’t make a bespoke item for that application.

  • PhilK

    See my reply to Eamon. In order for the lens to actually perform well at the wide end with the aperture wide open, you’d have to change the optical formula and element/barrel dimensions.

    It’s more than just the physical diaphragm opening size.

  • PhilK

    The other thing is that it takes more than an aperture opening to make a lens that performs well at a wider opening. Anyone can make an f0.2 lens if they want, but making it good optically and small enough to be practical to use is something else entirely.

    This lens was designed as 2.8 constant aperture. If it were designed to float to a wider aperture at the wide end, then in order for the performance to be acceptable wide open at that end of the zoom range, most likely the elements and barrel would all have to be increased in diameter so that all the light rays at the edges weren’t hitting the elements at extreme angles and hitting or bouncing off the barrel walls.

  • MyrddinWilt

    Oh very good, the boss does the lens disassembly because then he has nobody to blame but himself should he bjork the 180-400 f/4.

    Was wondering if the Z series teles were worth getting when the F-mount can do double duty. Seems like there may be a reason. This is basically where all the new equipment has been focused on in the factories.

  • This diagram is helpful. I do a bit of optical design work, but that’s more for telescopes and nothing as complicated as zoom lenses.
    1) Why does this diagram show rays passing outside the entrance pupil P?
    2) What does the ray trace (particularly the entrance pupil) look like for off-axis rays? I would guess that the entrance pupil is still the same size, but is shifted?

  • DrJon

    Although when people hear Loctite they tend to think Super-Glue and this stuff is Thread-Lock (also quite possibly not by that exact firm), which is designed to break if enough force is applied (meaning when being unscrewed, with a little extra power, but not moving with vibration).
    (Okay, strictly there are higher-strength Thread-Locks which need heating before unscrewing, but no-one’s using those in lenses… hopefully…)

  • I have solved filter issues by adding a thin step ring on the front of those plastic body lenses I have that I use fliters on, before the lens gets damaged, of course! Cheap way to protect the lens, and cheap to replace should it ever need replacing. Should work on this lens as well!

    Lens hoods is a more difficult issue, though.

  • Jim Huang

    I disagree. Lens disassembly is easy. Putting it back together is hard. Haha~

    Awesome article as always, Roger 🙂

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