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Thread started 22 Dec 2013 (Sunday) 18:04
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Quick AF Microadjustment question

 
Nick_Reading.UK
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Dec 22, 2013 18:04 |  #1

Does the + move the focus in front of the subject and the - behind the subject? Or the other way round?
See what I am thinking is... That if you adjust to focus a couple of mm in front of subject you might get a better in focus keeper rate, but of course this will not work in a really shallow DOF Situation. Anyone else thought about this?


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JeffreyG
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Dec 22, 2013 18:29 |  #2

+ puts the plane beyond the subject.

Curious, why do you think setting it to front focus a bit will make it more accurate? My experience is that setting it to be perfect yields the most accuracy.


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Gobeatty
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Dec 22, 2013 18:33 |  #3

Nick_Reading.UK wrote in post #16547664 (external link)
Does the + move the focus in front of the subject and the - behind the subject? Or the other way round?
See what I am thinking is... That if you adjust to focus a couple of mm in front of subject you might get a better in focus keeper rate, but of course this will not work in a really shallow DOF Situation. Anyone else thought about this?

I believe it's the other way around. That is, + moves the focus point farther from the camera and - moves the focus point closer. If you have a setup that gives you a clear result of where the focus point is, a few test shots at 0 then + and - 10 should show clearly which way it goes. If you don't have a test setup that shows clearly where focus and dof are, may be better not to fiddle with micro adjust.

I did consider along the lines you are. I almost always focus to a front part of my subject so why throw away DOF in front of this point. It might be worthwhile in very specific set ups (specific lens, portraits, known f stop, at a specific distance) but in the end I decided it wasn't worth sacrificing sharpest focus at my focus point, especially as you noted with fast lenses wide open. I have heard of photographers setting the camera to focus back a bit for exactly this reason. Perhaps someone more knowledgable will chime in.


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Nick_Reading.UK
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Dec 22, 2013 18:34 |  #4

JeffreyG wrote in post #16547697 (external link)
+ puts the plane beyond the subject.

Curious, why do you think setting it to front focus a bit will make it more accurate? My experience is that setting it to be perfect yields the most accuracy.

Not more accurate, just maybe more of a keeper rate, example if you focus on a tip of someone's nose but move the camera a fraction then the tip of the nose might be out a little.. Just thoughts nothing else.. :-)


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hollis_f
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Dec 23, 2013 03:51 |  #5

Nick_Reading.UK wrote in post #16547703 (external link)
Not more accurate, just maybe more of a keeper rate, example if you focus on a tip of someone's nose but move the camera a fraction then the tip of the nose might be out a little.. Just thoughts nothing else.. :-)

Or, you could move the camera a fraction in the opposite direction and burger it all up even more :confused:


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Quick AF Microadjustment question
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