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07-29-2011, 08:35 AM   #1
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AF Fine Adjustment

There is no clear information in the K-5 user's manual as to which way to move the adjustment scale to correct front or back focus. So, if a lens is front focussing with the AF scale at 'Unset' or '0' should you dial in a '+' or '-' setting to correct it?

Nikon have a effective method, showing a camera icon at one of the scale and a mountain icon at the other to suggest movement towards or away. Michael Reichmann in Luminous Landscape says put in a minus adjustment for a front focussing lens (which is my instinct), whereas Amateur Photographer magazine, in a recent article on focus adjustment, says do the opposite, ie input a '+' setting for a front focussing lens.

You can see where the confusion arises - anyone with a definitive answer, please?

PS. Spoke to Pentax UK customer service and they didn't know either! Said to try bracketing and see what happens. Not confidence inspiring

Last edited by Bramela; 07-29-2011 at 12:20 PM. Reason: Reference no longer applicable
07-29-2011, 09:17 AM   #2
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This is the second post with this question in the last week. I think I could test it with one or two tries and have the answer much faster than typing in the question. But for those that don't have a K-5 to test with, negative values push the center of the DOF back, further from the camera. So for front-focusing issues, start with a (-5) value and retest.

As far as the person at Pentax-UK not knowing the answer....don't sweat the small stuff.
07-30-2011, 08:05 AM   #3
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Thanks, Lee. I posted the question on the beginners' forum without reply after over 360 views so posted it again here.

Thanks for the info - it is as I thought, that a minus input would push the focal plane away from the sensor plane. The readers of Amateur Photographer will be confused!

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