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05-09-2012, 11:08 PM   #1
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K-5 AF fine tuning question

I am able to fine tune 3 of my lenses by following instructions that I found on the followng link

PENTAX DSLRs: PART-1. Autofocus Adjustment charts for front and back focusing problems. Good for Pentax, Canon and Nikon.

But I wonder if I am compromising on anything at all by doing so? If yes, what am I compromising?



05-09-2012, 11:34 PM   #2
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Are you actually having AF problems to begin with?
05-10-2012, 12:44 AM   #3
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you may download some free af test charts from here
i found that the ff or bf depends on the type of the light... red light=crazy ff... but white or yellow is spot on... maybe in warm light its like 1mm ff but not in all cases, so i left the settings untouched.
05-10-2012, 01:08 AM   #4
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AF does vary dependent upon light wavelength, i.e. if autofocussing in daylight vs. tungsten the accuracy could vary, especially if the light level is also low.

What are the lenses? If zooms, you could find that the af will be out at one end of the range if you set up at the other.

Last edited by JohnX; 05-10-2012 at 02:59 AM.
05-10-2012, 08:37 AM   #5
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all in all you are not compromising anything, as long as you have in mind that the autofocus performance changes depending the light wavelength...
if you shoot in specific light conditions then you can perfectly optimize the AF.
if you want an all around setting, well, it wont be perfect... you have to optimize for the light conditions you usually shoot, and compromize for the less used conditions... or remember the settings and change them accordingly.

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