D800 is within factory standard! Needs +20 to stop it front focusing.

Started Feb 20, 2013 | Discussions thread
John M Roberts
Senior MemberPosts: 1,458
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Re: Mike, Robin, anyone else for that matter
In reply to michaeladawson, Feb 21, 2013

michaeladawson wrote:

Robin Casady wrote:

digital ed wrote:

Robin Casady wrote:

digital ed wrote:

Assume LV manual focus gives best focus for Cam/Lens/FL/Aper/Illum.

YMMV, but I wouldn't trust LV manual focus. I find that it is not as accurate as one could hope. I think it better to take a shot and enlarge it in playback (or Lightroom tethered). Delete the image if it isn't right and try again. Tedious, but because of the poor quality of LV, I think it would be more reliable for critical focus.

BTW, I find LV CDAF to be less reliable than PDAF on my D800E.

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Robin Casady
http://www.robincasady.com/Photo/index.html
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
— Bertrand Russell

What can give the photographer a better example of the optimum focus than focus on the sensor itself.

Having a better quality Live View. With line-skipping and noise (especially in low light) I find LV on the camera LCD to be less than ideal. I've done a number of shots where PDAF produced a better focus than I could manually focus in LV with medium magnification (full magnification being beyond 100% and often unusable).

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Robin Casady
http://www.robincasady.com/Photo/index.html
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
— Bertrand Russell

I can attest to your experience Robin. I have been through my share of AF point testing with my D800 in futile attempts to satisfy my fear that I could have a body with an issue. For the record, I don't believe I have a problem body. But that doesn't keep me from testing from time to time

Anyway, to the point... During all this testing I often find that the PDAF image is sharper than the CDAF image from LV. And in my experience it happens with both AF and manual focus when in Live View. Not a lot... just often enough to keep those seeds of doubt in my brain.

I have not yet been comfortable trusting my eyes with LV manual focus. I hear and read a lot that to obtain the best results, use LV. If I have time, which I usually do with much of my subject matter I will use my method used for 40 years, through the viewfinder manual focus. This is more difficult with my DSLR's and especially at infinity where detail is so small. Sometimes I do find this faster then to rely on the camera to determine what exact area I am wanting in focus.

Now days are we able to trust the VF when it appears to be in focus? With my cameras it seems so but that may be an isolated sampling. In what mechanical conditions can the FV show sharpness yet the sensor plane may not and to what level of concern can this actually be?

Thanks,

John R

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Mike Dawson

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