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02-04-2012, 09:36 AM   #1
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AF adjustment with 1.7 AF TC

Seems to not work with my setup. I am using a Tamron Adaptall-2 400mm f 4 with a Pentax-F 1.7x AF adapter. I was hoping the AF part would add some front focus adjustment but it doesn't seem to take it. Any thoughts or experience welcome.

Dave

02-04-2012, 10:58 AM   #2
Ole
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Front focus / back focus adjustment is only available with lenses which the camera can recognize. The camera cannot recognize your Tamron Adaptall-2 lens.
02-04-2012, 11:13 AM   #3
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QuoteOriginally posted by Ole Quote
Front focus / back focus adjustment is only available with lenses which the camera can recognize. The camera cannot recognize your Tamron Adaptall-2 lens.
Huh. See, I would think the camera body would "recognize" the 1.7x AF adapter due to its unique ID... but maybe it just "passes-through" the information from the lens? Might have to mess around with my AFA.

EDIT: Sure enough, you cannot set an individual "AF Adjust" for the 1.7x AF adapter. Now I'm glad that mine appears to be spot-on for my K-5...
Sorry Dave!

Last edited by panoguy; 02-04-2012 at 01:28 PM.
02-04-2012, 12:12 PM   #4
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What a bummer. Well I will just have to shoot a bunch and hope for a couple of nice hits. It is close but the main focus is a little in front of the subject. I need to try my Tamron 2x TC and lens with none to see if there is some combo that works. Just realized I could use my neighbors back picket fence for lens testing. Very accurate for the distances I will be using the tele for in the field. Thanks for the info, Dave

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