Canon 7D focus issue-new observation

Started Mar 31, 2013 | Discussions thread
ldgehman
New MemberPosts: 9
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Re: Show a video plus other thoughts
In reply to jckk, Apr 7, 2013

jckk wrote:

Since the jitters are seen in liveview, put it in video mode and upload a clip of the phenomenon to youtube so that we can see exactly what you are experiencing.  Put in comments such as what lens, how it's mounted, where it's located (inside, outside) in relation to the target.

When you say that you tested this on a tripod, can you give more details?  Info such as what tripod, head, how it's mounted and balanced on the head, is the center column raised at all, what surface is the tripod on, etc.

Keep track of the conditions when you encounter this issue and note every detail that you can. From the info provided so far, it sounds like it's due to atmospheric conditions.  It doesn't take hundreds of feet of distance to cause an impact to the images.  I've seen it on occasion when shooting from my car (I turn the engine off each time I stop to shoot) even at maybe 30' or so and possibly when shooting over a body of water at relatively short distances.

Final thought is that if this is due to a hardware issue, it will most likely be very difficult for Canon to diagnose it since it's intermittent.  My guess is that they'll run diagnostics, but if they come back within spec and you can't provide instructions to replicate the issue, there won't be too much else for them to do.

James

You mention in your post that it could be due to atmospheric conditions, and though it's hard to believe, I am beginning to see a pattern that supports that idea. I am consistently focusing on the same targets from inside the house through an open window. The last couple days in the morning and evening the jitter disappeared. Starting about late morning through the brightest part of the day I see the jitter. The objects I'm focusing on vary from 50 to maybe 150 feet away. I thought it was intermittent but now I'm thinking it may have been dependent on the conditions in which I was shooting. Some days when I was testing it was overcast with no sun and therefore I may not have seen the jitter. One of the objects I was focusing on today has out of focus blue sky in the background. If I looked really close I could see like a shimmery effect through the view finder that appeared like the magnified jitter that I see in LV. Could it really be atmospheric with these relatively short distances? I feel like I'm chasing my tail!

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