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Canon f/2.8 300mm IS USM II - How to set to "0" again

Started Sep 26, 2014 | Discussions thread
tvstaff
OP tvstaff Veteran Member • Posts: 3,264
Re: Canon f/2.8 300mm IS USM II - How to set to "0" again

tvstaff wrote:

Here is an example of an OOF shot

rebel99 wrote:

tvstaff wrote:

When I first got my Canon f/2.8 300mm IS USM II is was tack sharp with my 1DX.

Out of the box

I noticed after one session of shooting about 10,000 pictures that it was not as shrp or quick to focus.

I've had the 300mm back to CPS twice and it's still not as good as it was.

I'm wondering if there is an "outside" service that can set this lens back to factory specs. Canon can't seem to get this right after two tries.

Can anyone suggest any service in the NYC area that can get me back to "0"

P.S. MA does not improve anything from 0 all the way to 20 using manual 10 ft increment objects or FOCAL

it happens to my 300mm f2.8II and 600 4.0II on my 1dmk4/1Dx also. i'd shoot a burst in which half of it would be in focus and the other half won't but when it is in focus, it is tack sharp, so, sounds like camera is the culprit!

cheerz.

Im lost as to why this happens, but i've never read about this kind of problem again.
I'm gonna think out of the box. Maybe what i say is nonsense, but i go on anyway.

Maybe some bad custom functions in AF settings? Have you tried single AF point for example ? (without expansion?). If that would work, it would rule out lens problem.
Have you even tried a static subject? 
Try doing a controlled test.

Thanks for writing. Tried everything you mentioned and more. -- Feel Always Humble - "FAH" - You'll Learn More http://tony6454.wix.com/aruba-kitesurfing
 tvstaff's gear list:tvstaff's gear list
Canon EOS-1D X Canon EOS-1D X Mark II Canon EOS-1D X Mark III Fujifilm GFX 100S Canon EF 35mm F1.4L USM +28 more
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