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07-20-2009, 12:13 AM   #1
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K20D Focus Adjustment

Had a quiet afternoon, so have put my lenses through the K20 focus adjustment.
Some were seriously back focussing.

Of particular interest was the Sigma 135-400...@135mm it front focussed in the extreme...was spot on from about 170 through to 320....and then back focussed to hell @400mm....bit hard to adjust that!!!

The cheapest lenses in my kit, the Tamron 70-300 & Pentax 35-80 were spot on.

Interesting exercise.


07-20-2009, 12:39 AM   #2
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Good observations - I'm yet to do this exercise also, though so far I haven't noticed focusing problems.

Hope there's some way you can calibrate the Sigma lens...
07-21-2009, 05:55 AM   #3
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I have room in my rubbish bin Grant. It holds that 135-400 perfectly. Ive mentioned this before and i have a look every morning but its not there yet. )))
07-21-2009, 02:57 PM   #4
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I know you have mate, and when I can afford a 60-250..... I'll do you a good deal on it

but right now its got a job to do.


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