Another method for fine tuning AF


JohnX

Link Posted 12/05/2014 - 09:11
Although he talks about Canikon, I can't see why this won't work on Pentax?

Anyway, over to YouTube> link

andrewk

Link Posted 12/05/2014 - 10:15
Interesting - I might try that.

The method I've used with the 55-300mm is to take lots of shots of a distant non-moving subject at each AF setting, average the RAW (or JPEG) file sizes for each AF setting and then pick the setting that gives you the biggest file size - and hence the most detail.

How do others do this?

Andrew
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redbusa99

Link Posted 12/05/2014 - 10:35
you want a large garden for a 500mm lens.
odd lens or 2

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kh1234567890

Link Posted 12/05/2014 - 12:22
andrewk wrote:
Interesting - I might try that.

The method I've used with the 55-300mm is to take lots of shots of a distant non-moving subject at each AF setting, average the RAW (or JPEG) file sizes for each AF setting and then pick the setting that gives you the biggest file size - and hence the most detail.

How do others do this?

Andrew

That's more or less what I do. The key is the 'distant object'. I also pixel-peep once I get roughly the right setting. It always amazes me what lengths people go to with their charts and whatnot. Once you've got the infinity setting right then the camera should read the near distance corrections from the lens. Except when you have a Sigma lens.
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