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Thread started 23 Apr 2011 (Saturday) 13:32
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Question about Micro adjust for 70-200

 
dkim82
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Apr 23, 2011 13:32 |  #1

Hi- I'm not quite sure if this has been discussed- I'm on my iPhone, which doesn't allow for me to search for specific things, so sorry if this has already been beaten to death.

I noticed my AF is not quite accurate at 70mm, but decent at 200mm. If I microadjust to compensate for the 70mm range, it messes up the AF for the 200mm range.

Has anyone dealt with this before? Any help is greatly appreciated- thanks!

Dave


5d mk2 - Canon 28-70mm f/2.8L - Canon FD 35mm f/2.8 tilt/shift - Zeiss 35-70mm f/3.4 - Canon 70-200mm f/2.8L IS - Zeiss 85mm f/1.4 -
Epson RD-1 - Voigtlander 35mm f/2.5 Color Skopar
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ilguercio
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Apr 23, 2011 13:50 |  #2

I finally bought a 50D and can't understand if my fine tuning is doing anything at all.
I am trying to fine tune my 70-200 2.8 and looks like no matter what regulation i set the result does not change.




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Sdiver2489
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Apr 23, 2011 13:56 |  #3

Set it to be either:

1. The best at the range you usually shoot
2. The best at the most critical focal length focus wise(200mm)
3. Decent at both lengths but not perfect at either

or send it in to Canon and see how they do. No guarantees there either. There is a certain degree of "slop" that I'm willing to accept. Are you sure its actually misfocusing and its not just picking up other details in the larger FOV of the 70mm shot?


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ben_r_
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Apr 23, 2011 14:01 |  #4

Huh, I thought the Micro AF adjustments in the camera bodies were supposed to compensate for the focal variances in zoom lenses as it was a predictable AF difference throughout the focal range. Maybe your issue is more a simple AF adjustment. Perhaps you should send it in...


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Higgs ­ Boson
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Apr 23, 2011 14:03 |  #5

My plan is to only use MA for primes.... :-)


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dkim82
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Apr 23, 2011 14:04 |  #6

thanks fellas but the replies.

sdiver - i think i'm doing it right. I've got it on a tripod, using center af point with a remote shutter release. it was indoor with a flash @1/200sec shutter speed - admittedly, a slower shutter speed, but the test was done for both 70 and 200mm under the same conditions - and the 70mm was consistently softer.

sigh - for a $1000, I wish it could be sharp at all ranges


5d mk2 - Canon 28-70mm f/2.8L - Canon FD 35mm f/2.8 tilt/shift - Zeiss 35-70mm f/3.4 - Canon 70-200mm f/2.8L IS - Zeiss 85mm f/1.4 -
Epson RD-1 - Voigtlander 35mm f/2.5 Color Skopar
Leica Digilux 2

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dkim82
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Apr 23, 2011 14:07 |  #7

ya - it seems to make more sense to use the ma with primes, but i thought i'd give it a shot with the 70-200 and discovered at the wide end, it was a little soft

i'm gonna be at the beach on a shoot this afternoon - let's see how it goes in a bright real life situation. thanks for the replies everyone!


5d mk2 - Canon 28-70mm f/2.8L - Canon FD 35mm f/2.8 tilt/shift - Zeiss 35-70mm f/3.4 - Canon 70-200mm f/2.8L IS - Zeiss 85mm f/1.4 -
Epson RD-1 - Voigtlander 35mm f/2.5 Color Skopar
Leica Digilux 2

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Sdiver2489
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Apr 23, 2011 14:14 |  #8

dkim82 wrote in post #12278714external link
thanks fellas but the replies.

sdiver - i think i'm doing it right. I've got it on a tripod, using center af point with a remote shutter release. it was indoor with a flash @1/200sec shutter speed - admittedly, a slower shutter speed, but the test was done for both 70 and 200mm under the same conditions - and the 70mm was consistently softer.

sigh - for a $1000, I wish it could be sharp at all ranges

Do the same test with contrast detect autofocus and also test all your focus points. Each one can be have differently. My 24L is Adjusted to be best with the center focus point and decently accurate with every other point. In the field it probably won't matter much as these errors I'm seeing are in very controlled scenarios and very minor.

Post your shots on here as well for evaluation


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dkim82
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Apr 23, 2011 14:17 |  #9

will do sdiver


5d mk2 - Canon 28-70mm f/2.8L - Canon FD 35mm f/2.8 tilt/shift - Zeiss 35-70mm f/3.4 - Canon 70-200mm f/2.8L IS - Zeiss 85mm f/1.4 -
Epson RD-1 - Voigtlander 35mm f/2.5 Color Skopar
Leica Digilux 2

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dkim82
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Apr 23, 2011 14:20 |  #10

hey it's saturday everyone - time for a laugh:

http://www.youtube.com​/watch?v=32wC5pC5LBQexternal link

have a beautiful day - happy shooting!


5d mk2 - Canon 28-70mm f/2.8L - Canon FD 35mm f/2.8 tilt/shift - Zeiss 35-70mm f/3.4 - Canon 70-200mm f/2.8L IS - Zeiss 85mm f/1.4 -
Epson RD-1 - Voigtlander 35mm f/2.5 Color Skopar
Leica Digilux 2

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cristphoto
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Apr 23, 2011 19:42 |  #11

Per Canon's instructions you always micro-adjust on the setting that has the least DOF. This means wide open and, if a zoom lens, at the maximum focal length.


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hollis_f
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Apr 24, 2011 05:36 |  #12

ben_r_ wrote in post #12278704external link
Huh, I thought the Micro AF adjustments in the camera bodies were supposed to compensate for the focal variances in zoom lenses as it was a predictable AF difference throughout the focal range.

No, it's more complicated than that. I've not bothered with MA on any of my zoom lenses.

ben_r_ wrote in post #12278704external link
Perhaps you should send it in...

Yes, this is the best option if the problem is bad enough to warrant it. If I recall correctly, Canon use a 3-point calibration for zoom lenses.


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ilguercio
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Apr 24, 2011 08:06 |  #13

cristphoto wrote in post #12280185external link
Per Canon's instructions you always micro-adjust on the setting that has the least DOF. This means wide open and, if a zoom lens, at the maximum focal length.

I'm trying to do it but it looks like no matter what setting i dial in the AF keeps behaving randomly. There is not a huge difference between -20 and +20 (and there should be a lot of it) .
Did anybody manage to adjust the AF in a definitive way on a bright zoom lens?




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Question about Micro adjust for 70-200
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