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Author Topic: Canon Auto focus micro adjustment  (Read 8111 times)

marcmccalmont

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Canon Auto focus micro adjustment
« on: November 29, 2008, 10:12:01 pm »

Does any one have a good technique for adjusting Canon's Auto focus micro adjustment?
Thanks
Marc
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Marc McCalmont

michael

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Canon Auto focus micro adjustment
« Reply #1 on: November 29, 2008, 10:41:32 pm »

Wait about 1 week and I'll have a remarkable solution for you.

Michael

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marcmccalmont

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Canon Auto focus micro adjustment
« Reply #2 on: November 30, 2008, 12:56:12 am »

Thanks
I'll be patient!
Marc
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Marc McCalmont

Josh-H

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Canon Auto focus micro adjustment
« Reply #3 on: November 30, 2008, 04:00:28 am »

Quote from: michael
Wait about 1 week and I'll have a remarkable solution for you.

Michael

Now Michael thats just teasing! :-)

I have found this method very effective in the meantime.
Micro Adjusting your lens

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Henry Goh

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Canon Auto focus micro adjustment
« Reply #4 on: November 30, 2008, 04:36:21 am »

I've calibrated my 11 or 12 lenses on my 1Ds MKIII maybe 7 or 8 times.  Each time I tried different methods suggested by various people.  On every occasion when I re-calibrated I found there was some minor adjustments needed again.  Since I documented results with each cycle, I know definitively what changed and by how much.  Finally, I came up with my own flow for doing this with great precision.

What I now do is set the camera up on a firm tripod and choose a slightly slanting target so that I can see changes in DOF.  Next I shoot tethered to C1 Pro.  In C1, I make the first shot as the primary variant so that with subsequent shots, I can view @ 100% the change in sharpness and point of focus in the comparison viewer window.  In other words, I get to see 2 images side-by-side.  I shoot wide open with all lenses.  When I see an image is sharper at the correct point I'm focusing, I make that new shot the primary variant so that subsequent shots will now be compared to this reference.  I continue micro-adjusting focus until I find the best focus.  I find this method to be the most reliable and accurate. Usually, you will notice also that when the best focus is reached, micro-contrast will also improve, on some lenses, significantly.

Please give my method a try and let me know if you find it helps your calibration.  I love the ability to micro-adjust and I wish my 5D had this function.  Guess I will need to buy a 5DII just to be able to do this.  I will not but another DSLR that cannot be micro-adjusted.

Good luck.
« Last Edit: November 30, 2008, 05:00:32 am by Henry Goh »
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Andy M

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Canon Auto focus micro adjustment
« Reply #5 on: November 30, 2008, 05:07:30 am »

I used: http://www.northlight-images.co.uk/article...adjustment.html

A couple of tips:

1) The lens must be wide open
2) The lens should be at its longest focal length


For reference, my lenses:

17-40L = +10
24-70L = +16
70-200L = +10
35L = +15
85L = +12
135L = +3

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eleanorbrown

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Canon Auto focus micro adjustment
« Reply #6 on: November 30, 2008, 10:40:55 am »

I experimented using  different ways of focus adjustment with my 1Ds III and found that what works for me is to auto focus  (camera on tripod of course and non moving carefully selected target) then turn on live view and magnify all the way up.  Focus is a snap to check this way.  If the point focused on isn't in exact focus you turn the manual focus to exact focus and note whether it is further away or closer and make micro-contrast adjustments accordingly, then re check focus.  this is quick, and easy.  Don't know if you can find anything on the web about this method or not....I just found this works very very well and works for me. Eleanor
« Last Edit: November 30, 2008, 04:27:26 pm by eleanorbrown »
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marcmccalmont

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Canon Auto focus micro adjustment
« Reply #7 on: November 30, 2008, 05:06:44 pm »

Thanks for the inputs I'll give them a try
then compare to Michael's method next week
Marc
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Marc McCalmont

marcmccalmont

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Canon Auto focus micro adjustment
« Reply #8 on: November 30, 2008, 07:52:06 pm »

I combined all of your techniques and had good results;
Thanks
Marc
« Last Edit: November 30, 2008, 08:19:22 pm by marcmccalmont »
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