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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Jan 2018 (Saturday) 20:19
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70-200 mk 1 (non is) focus issues

 
Diamonddec
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Jan 27, 2018 20:19 |  #1

Hi, I have an old 70-200 mk 1 non is lens. I bought it used about 4 years ago. I dont know the lens' history. Anyhow, I was originally using it on a 7d mk1 with variable results. My tack sharp rate was as low as 30%. I did the usual focus tests but it would front focus, back focus and be spot on in a 5 shot series. Therefore I could not do the normal AFMA calibration. Any ideas why this might be?

Anyhow, my 7d died 4 months ago and I have been without a body until I bought a new 6d mk1 a couple of days ago. Not surprisingly, I have exactly the same issue. However, I noticed during testing, that if I manually set the focussing ring at the minimum focus distance, then tried t autofocus on something, say 20 feet away, the lens would move, but stop short of actually focussing and fail. I would then have to half press the shutter again for it to complete the focus successfully, albeit that it might or might not be tack sharp. So, it appears that it has to be fairly close to the focus range to focus in one go, or it stops short. Is this normal? I'm presuming not and that it should be able to focus from one extreme to the other in one go.

Thanks in advance for any replies.


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ed ­ rader
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Jan 28, 2018 02:22 |  #2

It's not normal. if you send it in to canon they will give you a free estimate for repair, or else you could sell it on ebay as is which is what i'd do. good luck.


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cristphoto
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Jan 28, 2018 09:50 |  #3

Have you tried cleaning the contacts on the lens? Sometimes its something simple. Otherwise send it to Canon as previously stated.


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Diamonddec
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Jan 28, 2018 15:42 |  #4

cristphoto wrote in post #18550878 (external link)
Have you tried cleaning the contacts on the lens? Sometimes its something simple. Otherwise send it to Canon as previously stated.

Yes, I cleaned the contacts yesterday. Thanks.


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70-200 mk 1 (non is) focus issues
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