Roger Buys a Camera System: Screening for Candidates

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As I mentioned in my last post, I have more time for photography now than I have for the last several years so I’m buying a personal camera system. While I can ‘borrow’ stuff from Lensrentals for a specific shoot I can’t just take a system and keep it at my house permanently.

My rule of thumb has always been if I need something 2 or 3 times a year, I'll rent it, but if I need it more frequently than that I should buy it. Over the last few months I've found myself shooting with something different than my current system (Olympus OM-D E-M5 based) at least once or twice a month. It seemed time to investigate my options.

The purpose of this post is NOT to convince you that my choices are right for you. What I need and want in a system isn’t going to be what you need and want. The process I use to reach the decision may be interesting to some of you - I certainly get a half dozen emails a week asking how to choose a system. For most of you, though, who already are locked into a system, these couple of articles will not be very interesting. I apologize and we'll return to our regularly scheduled blogging in a week or so.


Image courtesy Lensrentals.com, 2013

Meet the Purchaser

As I wrote once upon a time in The Rashomon Effect, every one of us is going to have slightly different priorities and therefore make slightly different decisions. To make this useful to you, I’ll have to let you know a bit about me so that you can note where your priorities are different. If your photographic priorities and opportunities are far different from mine, my thoughts about selection will be of zero benefit to you. If what you need is somewhat similar to me, you might find my thoughts to be of some benefit.

I’m looking for serious hobbyist level equipment that will handle most of my needs. I’ll ‘rent’ for specific needs every so often.

I shoot occasionally with everything – that’s my job after all. That being said, I’m most experienced with Canon, Nikon, and Micro 4/3. But I think I’m fairly brand agnostic. I don’t think there’s any clearly best system, at least not right now -- some have better cameras, others certain great lenses, and some have better service.

My photography skill level is moderate to good, definitely nowhere near great (If it was great I’d shooting bikini models on Ferrari’s nickel or on the sidelines at the Superbowl instead of writing this).

If I was a better photographer I could probably get by with lesser equipment. Since I am what I am, things that let me rescue borderline images, like image stabilization, extra megapixels, and a strong dynamic range may be more important to me than to you.

I have a good budget, but price is very important to me. I’m cheap. Plus within 6 months my wife will 'mention' whatever I spend on this system in comparison to a new piece of furniture or some home improvement. I’ll pay the man for something that’s clearly better, but if I can get 90% of the benefit for 60% of the price, I’ll head that way every time (A concept that my wife doesn't quite understand).

I’m also a reliability and customer service fanatic, and I expect to be treated like the good customer I am. I consider reliability and service at the top of my list when I buy a car, and a camera system can be a 'near car' expense. I realize very few of you are going to let that influence your decisions like I do, so I should definitely mention that.

Finally, I want to take pictures now, so I’m not going to worry about what may come out in 6 or 12 months. It’s never what I expect it to be, anyway.

So What Am I Looking For?

The most important part of my search process will come last. By that I mean that using the camera, looking at images, seeing how the camera handles and focuses, etc. are going to be the final word in my decision.

But, at my last count, there are 50 odd cameras I might consider. I'm not going to shoot with all of them for a week. First, I'll list out what I want, then do some screening research and come up with a list of systems that appear to meet my needs. Then I'll rank and test out what's on the list.

I should mention I'm a sucker for the cool features (the Canon 6D's wifi being my most current infatuation). I know myself well enough to realize I need to start logical before the bells and whistles make me loose my train of logical thought. I'll also look around the edges of my list because sometimes I don't realize I want something until I see it.

Nearly Absolute Requirements

I have a few requirements for my new system.  (Focal lengths I use below are full-frame equivalent.)


  • A reasonably lightweight 400mm telephoto lens (zoom or prime)
  • A high-quality macro lens (I prefer 100mm but am flexible)
  • A high-quality 24-70 f/2.8 (I might consider f/4 with stabilization)
  • A standard to slightly wide focal length, wide-aperture prime lens
  • A wide-angle to ultra wide-angle lens (20mm acceptable, 14mm preferred)


  • At least 16 megapixels resolution
  • A viewfinder (optical preferred, good EVF acceptable)
  • Shoe-mount flash
  • Excellent ISO 800 performance
  • Accurate Live View or contrast-based focus assist
  • 3 frames per second minimum in RAW
  • Microfocus adjustment


I won't say the above are completely non-negotiable, but there would have to be a reasonable alternative for each of these requirements. But I'm not completely ruling out any system at this point.

One note about my megapixel requirement: I know people get wonderful 60 inch prints from their 12 megapixel cameras. I've got a wonderful 60-inch print from my 1 pixel camera. I call it "Snow Bank in Fog".  Print quality depends on a lot of things including how good the initial shot was in-camera, what the subject matter is, viewing distance, and more.

I wouldn't hesitate to make a big portrait print from a 12 megapixel camera. But my macro images, heavily post-processed and often viewed from a foot or two away, really need at least 16 megapixels for a 20 inch print, especially if I've done a lot of post-process manipulation. I'll accept that a more skillful photographer may never need over 16 megapixels so we can avoid a 50-comment argument about it. But this is my camera and I would like more freedom to crop for composition, post-process more heavily if I desire, or makeup for a slightly missed shot.

Things I Would Like


  • A tilt-shift
  • A true supertelephoto (300 f/2.8 minimum, 500 f/4)
  • A selection of reasonably-priced, high-quality prime lenses
  • Good 70-200 image stabilized zoom


  • At least 20 megapixels
  • Excellent dynamic range
  • Excellent ISO 1600, adequate ISO 3200 performance
  • 5 frames per second in RAW
  • Excellent single shot AF performance (realizing this is somewhat lens-dependent within each system)

Preliminary Camera Screening

I could eliminate some systems that clearly aren't going to meet my wants now but I'd like to do a little more research first. I might find something that warrants further investigation.

I mentioned earlier that I can make most of the prints I want to from 16 megapixels, but sometimes feel I'm right on the edge there for what I print. Plus more pixels might let me crop a bit more aggressively if my composing is a bit off. I knew it would also make up, to some degree for a lens that doesn't resolve quite as well, which I confirmed in my last article.

There are sensor factors other than pixel count that are going to make some difference to me, too. I'm not going to test those factors because DxOMark has already done that work better than I could.  DxOMark is not The Word; nothing that tests a single sample can ever be The Word. But it provides excellent sensor data (please don't twist this remark to claim I said something about their lens reviews; I'm talking sensor data) very nicely presented and easily used.

The Overall Sensor Score is a very blunt tool; I don’t find much benefit in compressing umpteen data points into a single number. However, I do find the three specific scores for high ISO performance, color depth, and dynamic range quite useful. I should mention I'm not looking for which camera has the absolute top score; I'll leave that for Fanboys. I use it to compare cameras, find a range I think is excellent and good, and later compare those cameras for other factors.

Let's start with the simplest benchmark, high ISO performance. The graph (color boxes are mine) simply shows the highest ISO setting at which each camera kept a 30dB signal to noise ratio, 9EV dynamic range, and 18-bit color depth. If you don't care what that stuff all is, then simplify it by saying the ISO at which the camera was still giving really good images right out of the camera.

One of the nice things about the DxO graphs is they show the cameras by year of release so it let's me know that the Nikon D3s (green arrow at the top of the page) has as high ISO performance that's as good as the newer cameras to it's right. This is a great tool to find 2 or 3-year-old camera that might fill your needs at a bargain price on the used market.


DxOMark Sensor ISO performance www.dxomark.com


Again, I'm not looking for the very best camera. Real-world factors are going to make splitting hairs between the Nikon D600 (green arrow in the top corner) and the Canon 6D (green arrow along the right edge) a pretty silly thing to do. Rather I roughly thought everything in the red box is really, really good, the ones in the yellow box were certainly going to be acceptable to me, and those close to the yellow box would probably be just fine.

I repeated the exercise with the DxO Dynamic Range Score - (the DxO DR scores are measured at baseline ISO and I don't always shoot there, but it's still a worthwhile thing to look at).   One EV equals about a stop of light. My red box for this graph shows cameras within 1 stop of the best (the Nikon D800) and my yellow box within about 1.5 stops of the best.


DxO Dynamic Range performance www.dxomark.com


Color depth is a bit less important to me than to many people; I tend to postprocess in LAB space and false colorize regularly. But it's worth checking the same way since DxO makes it easy to do. The cameras above the red line, BTW, and a few inside the red box, are Medium Format cameras that I'm not considering.


DxOMark Color Depth performance www.dxomark.com


When the dust had settled, there were 7 cameras that rated in my ‘best’ boxes in all 3 categories. There were 5 more cameras that rated best in dynamic range and color depth, ‘good’ in ISO performance, and several more that were at least in my ‘good’ boxes in every category and a couple that were 'best' or 'good' in two areas, but barely missed 'good' in Dynamic Range. I did eliminate those that had less than 16 megapixels and the medium format cameras from my list.

All Red (Best)All Yellow (Good)Near Miss (DR too low)
Nikon D800Nikon D3xCanon 5D Mk III
Nikon D800eNikon D7000Canon 6D
Nikon D600Nikon D3200Canon 5D Mk II
Nikon D4Nikon D5100Sony A900
Nikon D5200Pentax KII
Sony RX1Pentax K-5 IIs
Sony A99Pentax K-30
Pentax K-01
Sony A77
Sony A57
Sony NEX-7
Sony NEX-6
Sony NEX-5R


I looked at this list a bit and noticed a couple of things that were reassuring. First, the Olympus OM-D just barely missed the list, being just under my 'good' box in all the categories. I know that camera well. It fills many of my needs, although I will occasionally bump against its limitations. The list, then, contains cameras that should fulfill my needs, at least in theory.

Since I had decided the OM-D didn't quite meet all my needs, I didn't put it on the list. (Don't get me wrong, I love the camera and have used it extensively for months. It just isn't meeting enough of my needs now.) I should also note the Fuji X-Pro was not tested by DxO so it's not here for that reason. But again, it doesn't have the lenses that meet my absolute requirements list, so I won't consider it further.

The table surprised me in several ways. First, was the dominance by Nikon cameras. I knew the D800/600/D4 cameras were highest on DxO's rankings. I was a bit taken aback by how many Nikon APS-C cameras made this list and that no Canon APS-C cameras were even close. The current Canon crop sensor cameras are all older models due for replacement, but the gap still surprised me. Having shot with them, I know they meet my needs fairly well so perhaps my selection criteria was a bit tighter than it should have been. I certainly am not ruling them out just based on some numbers.

I wasn't surprised by how well the Sony bodies did. After all, Sony's sensor technology and patents are leading the pack right now. I was a bit surprised at how well the Pentax sensors rated. Again, I knew they were good, but perhaps didn't realize just how good they were. While I wouldn't rule out any camera just based on this list, the Pentax showing makes me very interested in looking at them a bit more thoroughly.

Narrowing Down a Little

I'm not ready to make a final list yet, but think it's time to focus down a little and do some further comparisons.

Going back to my absolute needs the NEX system doesn't really fill them. NEX doesn't give me the telephoto I want at the quality I desire, nor the standard range zoom. Sure, I could rig up some things on adapters and make something that works, but I've got too many other options to consider that a prime choice.

I've been using the Olympus OM-D as my 'home camera' for a while and on paper it meets all my requirements except the 400mm lens one. This is going to set some Fanboys off, I know, but having shot extensively with the Olympus 75-300 and Panasonic 100-300, neither makes it for me. I'm sure someone has used that combination to shoot a mountain lion for the cover of National Geographic. Unfortunately, the image quality I'm getting with either can't compete with good telephoto zooms on an SLR. I'm going to use the OM-D system as my baseline comparison. I expect my new system to meet my needs better than it does.

Obviously I'll want to evaluate the Nikon systems. I've demonstrated to myself (if no one else) that the resolution of the D800 bodies can let me use a slightly less capable lens and still get marvelous results. The performance of the Nikon crop-sensor bodies on my little DxO search makes those worth further investigation, too. I've historically shot full-frame, but spending the last 6 months with an m4/3 system has shown me I could probably do most of my photography just fine with an APS-C sensor camera and rent a big boy when needed.

I love Canon's lens selection, so I'm definitely going to consider a Canon system. While I know from experience the Canon crop-sensor cameras are capable, the numbers I'm looking at make me wonder if there's much to attract me with the Canon 7D or 60D. I certainly am going to look at the 5D Mk III or 6D, though. They're definitely competitive.

The Sony system definitely requires more investigation, too, and I'm interested in evaluating their improved AF system, which I've used only a few times. The surprise to me, at this point, is how well Pentax does by the numbers. I've shot with their cameras and been impressed by several features and the ergonomics, of course, but I haven't really considered it as an entire system. I will now.

I don't need a 10-frames-per-second pro body for what I shoot, the Canon 1D IV and 1Dx, and Nikon D4 and D3x aren't on my list. I may revisit things and decide to look at some other cameras later, but for right now this is what I think I'll consider further:


Full Frame:


APS-C Frame

I'm not certain the camera I choose will be one of these, but they're certainly the front runners at this point.
In the next article I'll look a bit at system (rather than camera) costs before I start actually evaluating things further.


Roger Cicala


February, 2012

66 Responses to “Roger Buys a Camera System: Screening for Candidates”

LensRentals Employee

Roger Cicala said:

Armis, it won't cover my telephoto needs I'm afraid. Nice camera overall, though.

LensRentals Employee

Roger Cicala said:

I don't think the 75-300 optical formula has changed with the new version. As I mentioned, though, I'm buying now. I've wasted months and months before, waiting for what's coming out that ends up not being what I'd hoped.

Lynn said:

Intrigued you'd get the Nikon D5200 over the Nikon D7000. I know it fits your criteria better, but for myself... the facts that the D5200 has no internal focus motor, and won't meter for older manual focus lenses, would both be dealbreakers. If I have an autofocus lens, I want to be able to autofocus, and not be limited to focusing manually. And if I want to play around with an old manual focus lens, I want my body to meter.

Still hoping that Nikon comes out with a replacement for the D300s someday, because I'll probably always want a crop sensor body, but I can't see its being the D5200 over the D7000.

Enjoying this series A LOT! And I'll keep the "cost" one away from my spouse...

Aaron said:

Huh, so the 1DX/1D4 didn't make the cut for the table, but the 5D3 did? I'm really surprised! Even though you aren't considering them, I would have expected the 1DX especially to make it onto the table.

Daniel said:

Nice blog series. Clear thinking applied to a practical decision. And humor--what a prized commodity in the product review field.

Hope you will consider a segment on Tilt-Shift lenses, as I have shelved my 4X5 (50 lbs. and slow) but miss the ability to control focus while keeping fairly large aperture settings. A good 24mm Tilt-Shift lens would bring back some of that view camera capability I miss in the 4X5. For your macro shots a 90mm tilt might surprise you by providing a change in relative size in images of parts of your circuit boards -- creating an illusion of receding horizon lines all well focused. In the Tilt-Shift area, Canon lenses would seem to have the lead, both for lens quality as well as flexibility of the mount to rotate the tilt and shift functions.

On a separate issue, I hope you address practical issues of hand-holding a camera, and ergonomics of controls. As I age I find hand-holding a camera to be less steady, and intricate menus are hard to remember. Both affect the outcome of images taken in the field. Image shake is well addressed in tests, but ease-of-use ergonomics are not well addressed. For instance, Zeiss and older Nikon lenses offer aperture rings where my left hand "expects" to find an f-stop adjustment. So a small vote toward older Nikon lenses and Zeiss/Sony. However, none of the VR enabled G series Nikons have an aperture ring. And on the issue of obscure menu settings, the D800/D800e lacks the ability to store and recall custom settings unless I save them on an SD/CF card.

Best regards and looking forward to more blog entries.


RohithT said:

Great stuff as usual, Roger.

I went through a similar exercise last year. I had an E-P1 and a good collection of lenses (Panasonic 20mm, Olympus 45, Olympus 9-18, and Olympus 14-150). The easy choice would have been just to get the E-M5 and be done with it.

I wanted to take the opportunity to reevaluate my needs, though, and see if another system would better satisfy my needs and better serve my growth as a photographer. I only considered full frame systems because I didn't see APS-C systems offering any significant advantage over a Micro Four Thirds system, except when it came to telephoto options.

In the end, the full frame options at the time (a used 5D Mk2, used D700, were the only financially feasible options for me since the 6D and D600 hadn't been announced) also didn't offer enough of an upgrade to make up for the additional gear cost, the lack of an EVF (I prefer EVF's to OVF's) and the multiples in weight/size (smaller/lighter camera gear can often mean the difference between doing all carry-on baggage on a trip and checking luggage). I ended up with the easy choice after all: I got the E-M5 and am quite happy with it.

That being said, had telephoto been a more significant part of my photography or had the 6D or D600 been available when I was making my evaluation, I might have swung the other way.

It's surprising that an Olympus-supported camera system has such poor telephoto options, since the Four Thirds system had so many great telephoto lenses. I hope Olympus, Panasonic, Sigma, and/or Tokina come out with something great in the next few months; it's the only significant hole left, now that the 12-35 and 35-100 F2.8 twins have been released. A 50-150 constant f/3.5 or f/4 would be killer (and hopefully well under $1,000).

sbiessel said:

Thanks for the informative posts. I had a similar quandary a while back. I had been shooting with a Canon 5DII and Pentax K5. I wanted the DR of the Pentax K5 in a full frame sensor, so ended up going with a D800. Happy with the decision, though I find the D800 to be less comfortable than either camera. The ergonomics on the K5 are fantastic, and I know I'll be kicking myself when they finally release a full frame. Though their lens selection has left me pretty frustrated at times. There's no perfect camera, unfortunately.

JonR said:

Your two "system" articles are excellent! I too have been going through this process having decided to adopt a lighter (weight) system (D300 & FX/DX lenses) due to my advancing age and emersion in nature photography requiring fast telephoto lenses. For about two years, I have been shooting with a lot of m43 (EM-5 & GH2 bodies & many lenses), Four Thirds Oly Pro telephoto zooms and my Nikon DX/FX gear (plus the Sony RX100 and the Nikon N1 V1 for special purposes).
My assessment is similar to yours re the OM-D EM-5: it's a great camera that meets my needs for macro, landscape, architectural, street and even multi-flash photography using the Pani 7-14mm f/4, 12-35mm f/2.8 & 45mm f/2.8 macro lenses plus the OLY 14-150mm walk around lens. The less than stellar performance of the m43 system comes in the telephoto range especially with consistent AF-C of moving birds in low contrast light. The Pani 100-300mm is a decent lens for nature telephoto work but the not nearly the optic quality of the OLY 90-250mm f/2.8 or the more compact OLY 50-200mm f/2.8-3.5 zooms even when the latter are combined with a 1.4x TC. These two lenses are surpurb but were designed to focus optimally with phase detect sensors. On the EM-5 they will focus under 3 seconds in AF-1 + M but not near instantly and continuously as they should.
Olympus is very aware that they have mostly orphaned their excellent Four Thirds lenses and have repeatedly announced their commitment to solve this issue with a new "pro" m43/43 camera body in 2013. It should have a mirrorless hybrid sensor - I hope - similar to the design used by the little Nikon N1. This little CX sensor has 77 (?) phase shift detect sensors buried in the same plane as the more abundant contrast focus sensors. (The N1 V1 with the TF1 adapter focuses my 200-400 F/4 instantly while producing an equivalent 10MP image @ F/4 and 549-1024mm!)
Clearly, there is proven technology for Olympus to build a new m43/43 camera with an excellent sensor with a hybrid focus systems. (Note that the new Nikon D5200 has both focusing systems but no micro adjustment capability to correct for front/back focus issues.) Therefor, it seem advisable to wait for the new Olympus body before abandoning ones excellent m43 or Four Thirds gear and investing in more expensive an heavier APS-C or FF systems.

Heidfirst said:

As already mentioned it's not surprising about Pentax sensor performance as they use Sony sensors (as do a lot of the Nikons).
Where they may fall down for your needs is in availability of long (400mm & above) lenses & possibly in AF.

Justin said:

I commented similarly on the other post (just fyi)

Another consideration is to ditch the heavy zooms. For the D800e (as an example), mount a 24-120 f/4 and pick up a few primes. The trinity of 28, 50, 85 f1.8s are spectacular.

Add the Bigma you mentioned and you are done. Or if you are in need of a truly ultra-wide field of view, add one more zoom, either the 16-35 f/4 or the 14-24 f/2.8.

D800e - 3000
24-120 f/4 - 1300
28 1.8 - 700
50 1.8 - 220
85 1.8 - 500
Bigma - 1020

= $8900

Pretty reasonable for (arguably, barely) the best 35mm provides.

Max said:

I like the idea of using a camera that crops like the NEX7 for telephoto shots and using a full frame for wide angles. I am also willing to stitch some panoramas but in reality the Zeiss 21mm 2.8 does well on my NEX7 and will be 'expansive' on a full frame. I bought the Sigma 19 and 30 after reading Roger's enthusiasm for the 30 but a little testing makes it a no brainer to use the Zeiss when it really counts.


The Zeiss c/y 21mm 2,8 @ 4.0


The Sigma 19mm 2,8 @ 4.0


(Yes I know the bottom right ROI is dodgy but in the Sigma's favor - even still.... )

Andrew Herd said:

First, many thanks for writing such an outstanding blog - I learn every time I read it. Curiously, I have gone through much the same kind of evaluation, and shoot at work with Canon gear and at home with M43. The latter has its shortcomings, such as a lack of long telephoto primes, and no focus tracking capability worth mentioning, but it does have a huge advantage that you haven't gone into here, unless I have missed it, Roger.

M43 kit is so incredibly light and compact that I am temperamentally inclined to cut it some slack for its drawbacks. When a 150mm F4 gets released (hey, why are they all competing in the sub 30mm segment?), my calculations say I will be able to put it in a coat pocket. Now you try doing that with a 600mm 35 mm lens and see what size of pocket you need! I gain the impression that no-one at Olympus expected the E-M5 to do as well as it did and that its success in dragging the company out of a financial hole has changed some things. It surely has changed my perceptions about what kind of lens system I personally want - given a camera is basically a bucket into which you pour light through a lens, I am beginning to think that maybe a small, really efficient bucket ticks a lot of boxes.

Ed said:

You'll regret getting a camera without autofocus fine-tune, which Nikon omitted from their D5200.

Matthew Saville said:

Roger, allow me to spoil you on one small issue that has "ruined" me as far as amateur / advanced amateur bodies is concerned.

On all semi-pro and pro Nikon bodies, and on a few of the newest Canon bodies, there is a button customization that I absolutely cannot live without. 1-click 100% zooming during image playback. Canon is still working out the bugs on this one, but the 5D mk3 and 6D have at least a "Quick zoom" button now. You customize the playback initial zoom to be "actual size", and then on the 5D mk3 you program the "SET" button to do zooming. Now, instantly after clicking a photo, you can go BAM right to 100%. Even if you shot with an off-center subject, as long as you managed to get a focus point over that subject and lock focus, the camera goes right to that point. Same on the Nikons, with the center button customization. I like Nikon's implementation a little bit more because Nikon allows you to scroll from image to image without first hitting the playback button, whereas Canon still seems convinced that you should have to hit "play" before being able to review more than one image. At least the newer Canons are worlds better than the previous generations such as the 5D mk2, where it would drive me mad to be able to see the image on the back of the camera right away, but not be able to zoom or scroll to other images without first clicking "playback, zoom, zoom, zoom, zoom, scroll, scroll, scroll, scroll..."

It sounds like nothing, but once you get spoiled then it becomes oh-so-annoying when you're in any situation that even remotely resembles action, and you need to confirm 100% focus.

All this to say that, unfortunately, the D5200 and D7000, as well as the D600, lack this feature. In my opinion this is a huge error on Nikon's part. This is why, at my current situation and hobby, (adventure landscape / night time lapse photography) ...my top pick camera is absolutely the Canon 6D. That is not to say that I wouldn't take a D600 into the wilderness any day, especially if dynamic range was important. Heck a D5200 would deliver gorgeous image quality too, and it'd be so dang light I'd probably be skipping up the wilderness trails. I'd just have to make do without that zooming function.

For general and heavy-duty work, on the other hand, I cannot live without the zooming feature and I would absolutely not consider my system complete unless I owned a camera with such a feature.

Take care,

Harry P. Lux said:

great article and serious thoughts - Thank you Roger!
I do practical lens tests for more then 25 years now - for me, lenses are always first choice - and second I look for a camera - a camera that pleases my hand, my photography style and is fast and durable.
I loved the Olympus E-System (except for the AF and High ISO) , I liked even the Pen-Series, but the OM-D was a big disappointment - the zooms lenses (collecting dust inside) and the body are looking old and used after a few weeks of consistent shooting - not professional at all. The primes are other quality and stay dust free.
I always liked the Panasonic G2, GH2 and now the GH3 better and even the Nex 6 I would favorite.
But there is no one camera for all and everything what counts for me, are lenses, so I kept my Eos 5D3 and lenses like 2,8/300mm; 2,8/400 mm with extenders
IF one goes to 400 mm - there is only Canon - 2,8/300 mm & 1,4x - 4,0/400 mm; 5,6/400 mm or even 2,8/400 mm or 5,6/100-400 mm -
it's no Nikon, no Sony, no Pentax, no Sigma out there at 400 mm at the same quality, speed, lightweight and durability.
I had the fantastic 2,8/300 mm and the 2,8/90-250 mm from Olympus - but AF is weak and finally ISO 1000 is not fast enough for animals and sports, nor for children.
I had Nikon D3x with 2,8/70-200 mm and 4,0/200-400 mm - not bad, but for me, not good enough and to much is missing, like 5,6/80-400 mm AFS VR; 4,0/300 mm AF-S VR; 4,0/400 mm AF-S VR; 2,0/135 mm AF-S VR and better, lighter 2,8/70-200 mm VR; 2,8/300 mm VR; 2,8/400 mm VR; 4,0/500 mm VR; 4,0/600 mm VR - so Nikon is no option for tele - not for me - and when I see crazy price of the heavy 5,6/800 mm - no thanks.
Pentax has a few really great lenses, like the 4,0/300 mm - but mostly primes and the AF is unpredictable.
So if I had to pick one camera, it would be Eos 5D3 (today!)
but if I could pick too - the second would be the Lumix GH3
and third my IPhone 5 or Lumix LX7

and I use them all for different situations and with different lenses
I take a GH3 with 7-14 mm & 12-35 mm for a holiday
and I take a Eos 5D3 with 2,8/400 mm for telephoto
maybe some day, there will be an EOS M with viewfinder, fast AF and fine, small lenses ... someday when I wake up...

Patricia Dulaney said:

It is really good to think first before buying anything. If you need it always, then better yet buy it. If you don't need it frequently you can just rent and use your money for other stuffs that you'll be more needing.

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