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Thread started 05 Feb 2015 (Thursday) 09:24
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Canon 7D ii Compatibility Issue with EF-300mm f/2.8 IS

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Joined Feb 2015
Post edited over 4 years ago by BobAaron.
Feb 05, 2015 09:24 |  #1

I have owned the 7D for a year with no problems using the older EF-300mm f/2.8 fixed focus lens. Two weeks ago I purchased the new 7D Mark ii hoping to use this newer camera exclusively with the 300mm. I must have taken nearly a thousand shots with the 7D Mark ii and not a single photo was in sharp focus. The settings for both cameras were nearly identical [approx. 1/3000 @ f/3.2 ISO 250] and my tests using both cameras were conducted at the same time. I take horse race photos so I alternated cameras / lenses between races. No doubt about it. The 7D took nearly perfect photos while the 7D Mark ii was off every single shot!

I also tested both cameras with my 70-200mm IS ii f/2.8 and there was no obvious differences between the images. So the issue appears to focus (literally!) on the 300mm.

Fortunately B+H honored their 30-day return policy so I'm back to having to switch three lenses on one camera.

Someone said the problem might have to do with the new 69 points of focus in the 7D Mark ii but I cannot find any verification of this.

Any ideas what's going on here?

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Feb 05, 2015 10:00 |  #2

Bob, I can only speculate based on my own experiences. I am using the 7D2 with my 600II as well as mkIII TCs. I am getting about 70% front focusing, 5% back focused, 15% nothing in focus and 10% in focus. After conversations with Canon and one trip back to CPS, nothing has been resolved. They now have pictures from the camera to review. Couple things that have been mentioned by CPS reps:

1. If you are using a TC, you must follow the directions in the manual for attaching and detaching it. Camera powered off, camera removed, TC added to lens, camera remounted, camera powered on. They have been very clear that any deviation from this can cause focusing issues (even though it doesn't on any other body). She also mentioned this holds true with just changing lenses - the camera has to be powered off, mounted and then powered on to proper communication.

2. I have been told today that the communication between the camera and lens may be "off" and that I may need to send in the camera/lens/1.4/2x and have them "tweaked" to maximize output. I was told that the 7d2 is very sensitive in this nature and the combos must all communicate perfectly or you will have issues.

In your situation, you may be experiencing the latter, although, despite my struggles and issues, I haven't had an entire shoot be completely OOF, although I've come close.

I will say for the 10% or so in focus, the camera shines. The rest is just irritating.

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Cream of the Crop
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Feb 05, 2015 10:07 |  #3

If focusing is inconsistent, then there's no help, of course. If it's always off in one direction, micro adjustment may help. It's not too unusual that different amounts of such adjustment is needed for the same lens on different bodies.


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Feb 05, 2015 10:07 |  #4

Did you try to MFA it? It sounds to be a simple calibration issue. It could be that your old camera has a tendency towards backfocus (for example) and the lens has a tendency towards frontfocus, so they largely cancel out. If your new camera also tends towards frontfocus the combined error on both could be enough to cause the issue, despite both being within normal range individually. MFA would hopefully calibrate the lens to the body and correct the problem.

It could be that the 7DII actually was faulty and needed factory adjustment, but calibration at Canon should have sorted that, or found another problem.

I can't see that Canon have produced a body that just doesn't work with older lenses. I have an 8 year old 300 f/2.8L IS as well and it works perfectly with the 69 point AF in my 5DIII. I think you just had a body which is either faulty, in which case just get another one, or simply wanted to be MFA'd to the lens.

2 posts
Joined Feb 2015
Feb 05, 2015 18:58 as a reply to  @ huntersdad's post |  #5

Thank you for your quick response. I will be sure to always shut off camera between lens exchanges.

BTW (By the way), what do TC and CPS mean???

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Feb 05, 2015 19:35 as a reply to  @ BobAaron's post |  #6

TC = Teleconverter. Otherwise known as an extender.​om …neup/extender_e​f_1_4x_iii (external link)

CPS = Canon Professional Services
http://www.cps.usa.can​ (external link)

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Canon 7D ii Compatibility Issue with EF-300mm f/2.8 IS
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