I wrote:

> So I'd recommend to always perform
> two focusing tests for each lens correction, one coming from a closer 
> focus
> and another one from a farther one. If you get the same focus, you are 
> doing
> well and you can apply the needed correction.

The image comparison function of the K20D allows you to do that very easy 
and effectively; just:
1 - Shoot the two test pictures
2 - Press Playback button
3 - Press Fn button
4 - Press OK button for performing image comparison
5 - Press OK button for selecting both images
6 - Enlarge both images with the rear wheel and navigate them via the 
four-way selector.

Dario 


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