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12-28-2009, 02:18 PM   #1
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How to adjust focus

So, I've read a few posts on how to adjust the focus on the K7 / K20/etc. and all seemed to involve a printed chart graduated in cm that one had to set at a 45 degree angle, blah, blah.
I used that method but decided to try another, maybe easier method and see if it gave the same results. Using Scrabble tiles, I used the letters A thru G with A closest and G furthest away. D is in the middle and is the focus point.
The photos below are with the pentax 55-300. 1st taken at 135mm and second at 300mm. You can see that the lens goes from slight backfocus at 135 (compare B & F) to slight front focus at 300 ( compare C & E). So, I'm not going to adjust.
This is the same result I got using the chart.

Last edited by Workingdog; 02-02-2011 at 04:57 PM.
12-28-2009, 08:39 PM   #2
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It's normal for the in focus range to extend further behind the target than in front. It's only backfocus if the target itself is out of focus, or *way* offcenter in focus zone.

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