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I currently am using a Rebel T3 with my 70-300 L lens. I have been shooting for about 2 years now and find myself mostly shooting outdoors sports. I believe I have come to the point were I have out grown my Rebel T3, but I am not sure if I want to stay with an APS-C sensor or go full frame. I mostly shoot outdoors soccer and baseball. I was wondering if my 70-300 L would perform better as far as auto focus and image quality on a 7D or 5d Mark iii? Also, will 6 fps on the Mark iii be sufficient enough for sports? I thank you all in advance for your time and knowledge! Cheers!!!

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If the 7D and 5Dmk3 are on your list, you should also look at the 6D and 70D. –  Caleb Sep 8 '13 at 4:10

4 Answers 4

Like most things it depends. Do you shoot under lights at night? If so the 5dm3, is going to perform better (autofocus and cleaner high ISO), otherwise the 7d will perform wonderfully and provide greater reach.

As for FPS, in my experience as I get better at shooting most sports this matters less, as I am able to time the shots, rather than gunning through a sequence. If your timing is not great or you want to capture the stop action type sequences, the extra couple frames per second on the 7d will help.

I primarily shoot indoor sports (Volleyball), and have great success with a 5dm2, but it took a lot of learning to get the autofocus to work in this environment. I upgraded to a 5dm3, and it makes getting the shot much easier. I have also used the 5dm2/3 for soccer as well as twice I have shot with a 7d for soccer (with 100-400, not your 70-300). In general I would choose the 7d for daytime soccer for the greater reach.

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Nice answer! "I am able to time the shots, rather than gunning through a sequence" makes a lot of sense –  Jakub Sep 8 '13 at 17:47

Everything in life is a tradeoff, there isn't a clear-cut choice - you have to choose based on the factors that matter for you most.

The 5Dmk3 is definitely a better camera than the 7D (except for two things), it has better auto-focus, higher resolution, better dynamic range, and in general better everything - it also bigger, heavier and more expensive.

The two things where the 7D is better are the frame rate and the crop sensor (yes, full frame can be a disadvantage too) - with the 5Dmk3 you will get the same field of view at 300mm like your Rebel at 187mm, if you mostly shoot at 200mm-ish and below that doesn't matter but if you often go to 300mm you will need a longer lens with a full frame camera (to get the 300mm field of view you will need a 480mm lens!).

Like I said in the beginning everything in life is a tradeoff, the 5Dmk3 will take better picture but costs more and may require a new (expensive) lens - the 7D on the other hand will be cheaper and is still a very good camera.

You should also look into the 70D, it has a newer better sensor than the 7D and the same auto-focus system and will be cheaper - but it's not rugged like the 7D or the 5Dmk3.

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The improvements in the 70D sensor are mainly in the area of Live View/ video autofocus using hybrid sensels in the sensor to do the equivalent of PD focus when in Live View. There is less than 1/3 stop difference between the 7D and 70D in terms of Dynamic Range, Signal to Noise Ratio, Tonal Range, and Color Sensitivity. In fact the 7D has slightly higher DR than the 70D below ISO 800. dxomark.com/index.php/Cameras/Compare-Camera-Sensors/… –  Michael Clark Sep 8 '13 at 18:53
    
@MichaelClark - according to the DXO labs score the 70D is slightly (negligibly?) better in every way (except DR below ISO 800 where the 7D is slightly (again, negligibly?) better) - so with the 70D you get basically the same performance at an higher resolution + video auto focus as a bonus all for $300 less - I stand by my previous claim that the 70D's sensor is newer, better and cheaper –  Nir Sep 8 '13 at 19:46
    
Yes, and the same PDAF system that is the Achilles heel of the 7D. –  Michael Clark Sep 8 '13 at 19:57
    
I guess the point I was making is that, at least in my mind, the less than 1/3 stop differences are not significant enough to label the 70D "better". The 12% increase in resolution is a little more significant. The video focus advantage shouldn't make much of a difference here where any question including the word video is summarily dismissed as OFF TOPIC. The current price difference at amazon is only $140 USD. For that you are giving up about 50% of the 7D's buffer depth (firmware ver. 2.x) and a 50% higher shutter life rating as well as the weather sealed magnesium allow body. –  Michael Clark Sep 8 '13 at 20:22
    
@MichaelClark - that's what I said - the 70D has a better sensor (even if I'm not allowed to talk about one of the things that make it better) but it's less rugged - like I said in the first line of the answer "Everything in life is a tradeoff" - I never said the 70D is a better camera, only that it's worth considering. (if it was me, and I had the budget for a 5Dmk3 (I don't) and I could live without the extra reach of the crop sensor (not relevant, because of the budget issue) I would have bought the 5Dmk3, but that's me, everyone has different priorities and can make different tradeoffs) –  Nir Sep 8 '13 at 21:15

The autofocus consistency in terms of accuracy from shot to shot is worlds better in the 5D mark III which has a 1-series level focus system. The 7D on the other hand, while slightly faster and much more configurable than other consumer/pro-sumer grade bodies from Canon, is not consistently more accurate than them. I own a 7D and that is my biggest frustration with it. Even when the AFMA is dialed in, a good number of shots just miss correct focus. Some are front-focused, some are back focused. In my case that is with an EF 70-200mm f/2.8 L IS II mounted to the 7D. For more on the accuracy of various Canon bodies, see Roger Cicala's excellent blog article. For more on exactly how the 7D AF system works, see http://photo.stackexchange.com/a/41179/15871. Other multi-point systems, including the 5D3 are similar. To get the most out of them you have to understand the actual 'map' of the focus points and how the area of greatest contrast within the entire active area for any particular point is what the camera will focus on. But most other sophisticated multi-point systems are more consistent than the 7D.

On the other hand, the 1.6x crop factor of the 7D will give you more reach than the 5D3 with the same lens. If you crop a shot from the 5D3's 23MP down to the same size as the 7D's sensor, you will only have about 9MP resolution instead of the 7D's 18MP.

The larger pixels and newer design of the 5D3 also mean better low light performance. Real world testing gives an almost two stop edge to the 5D3 over the 7D in terms of noise at high ISO. And with the slower aperture of your 70-300 L compared to a constant aperture f/2.8 telephoto that is a key issue.

As far as frames per second go there are several considerations:

  • Maximum frames per second are only achievable at low ISO with many in-camera processing options turned off. Raise the ISO or turn on options like Highlight Tone Priority, Peripheral Lens Correction, or High ISO Noise Reduction and the frame rate will drop. There may not be as much real world difference between the 6fps of the 5D3 and the 8fps of the 7D, especially if you need to use a heavier noise reduction setting with the 7D.
  • Sometimes when shooting sports the number of frames isn't as important as being able to time the critical instant and being confident your camera can nail the focus. After all, six properly focused shots per second are better than 8 shots if half are out of focus.
  • Buffer depth seems more critical to me than frame rate, especially when saving RAW files. With the fastest UDMA-7 CF cards available the 7D can go 25 RAW files at 8fps before getting bogged down, the 5D3 can go 18 at 6fps. That's about 3 seconds worth of continuous shooting in both cases.

The 5D mark III costs about twice the price of the 7D. Whether the far superior focus system and significantly better low light/high ISO performance is worth it to you is a question only you can answer. The only other thing you will be giving away is the reach of the 1.6x crop factor of the 7D and a very modest difference in burst rate.

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The 6 FPS should be fast enough for sports if you have decent timing. The AF performance will be far better and more consistent on the 5D Mark iii. The main thing you will lose with the 5D over the 7D is the extra reach that the APS-C sensor gives you, but the improved AF points, speed and consistency will be more than worth it if you have the money to burn.

Full disclosure, I am a very happy 5D Mark iii owner that shoots with a 70-200 f/2.8L IS II and used to use the non-L 70-300 f/4 before the 70-200 f/2.8.

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