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KnightPhoto

Alberta, CA
4954 posts

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"RE: Focus problems?"

KnightPhoto Gold Member Nikonian since 18th Dec 2006
Thu 30-Aug-12 11:29 PM | edited Fri 31-Aug-12 05:01 AM by KnightPhoto

Hi Claudia,

I think it important to distinguish that you do not have the "left AF point focus problem", so that is GREAT news.

Nor do I, and I believe the OP does not either based on an offline discussion we had.

There was a known issue which has been blogged about widely by Nasim, Thom, a number of Nikonians,, and others on dpreview. It presents itself as a gross obvious error that your and my testing has shown we do not have.

I think that is a hugely important distinction to make.

In my case I have moved onto standard AF tuning of my kit, yesterday my 24-70 tested out at +3 on my D4 (it is +5 on my D700 FYI) and my more or less new 70-300 at +12. Anyhow standard stuff I do on all my cameras for the last three years and all my low-tolerance lenses (fast lenses and telephoto lenses). But that has zero to do with the main blog topic on the Internet.

If you were to ask Thom Hogan you will find he does much the same.

We have entered a time when we have such sharpness and resolution capability and known testing protocols and testing hardware and software that we can and will do this. But it doesn't mean these issues of design and manufacturing tolerances weren't always there. If the D800 shooters want to get all 36mp of resolution and they are now peeping at 100% on those 36mp, they have entered a realm of what I call "low tolerance photography". But that is a whole slew of lens, camera, and manufacturing and design tolerance interaction that has more or less always been present.

I suggest everyone's journey forward into low tolerance photography start with the important distinction that they either have the left AF issue or they don't.

The latter group is the desirable group to be in of course and there are many tolerable ways of dealing with non-left AF problems, starting with potentially doing nothing and just keep an eye out for any repetitive patterns in real world results

By all means start a separate thread with examples if anyone has specific concerns but be careful to separate the left AF problem cameras. I would also suggest poring through the blogs over at lens rentals if you want to see some excellent standard deviation analyses about PDAF. PDAF isn't a 100% operation, so we can adjust our shooting proactively to mitigate.

Best regards, SteveK

'A camera is an instrument that teaches people how to see without a camera.' -- Dorothea Lange
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This is a hot, active topic! Focus problems? [View all] , Clipper144 , Tue 03-Jul-12 11:27 PM
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