Paul, I started calibrating the K20D via Remote Assistant on PC. Then I've realized how quicker and still effective the use of the on-camera comparison can be. You don't have to be able to spot the tiniest detail for doing calibration. You just have to be able to recognize similar blur, and that's well doable on the camera screen. By using Tim Jackson's chart, when you see that those 2mm marks above and below the focus mark look the same, then both 6mm marks look the same (more blurred than 2mm) and then 10mm marks are even more blurred than 6mm, but yet similar each other, you've got proper calibration. Otherwise, if say "2mm above" is as blurred as "10mm below", while "2mm below" and "6mm below" look sharper, you've got front focus to fix. In other words, you have to check the overall behaviour in a narrow image area and not the single minor detail.
Dario ----- Original Message ----- From: "Paul Stenquist" <[EMAIL PROTECTED]> To: "Pentax-Discuss Mail List" <[email protected]> Sent: Monday, March 10, 2008 12:49 PM Subject: Re: K20D & AF calibration data > I've found that it's almost impossible to see minor differences in > focus o the camera's viewing screen. I shoot the images as RAW and > transfer them to my computer where I can compare them at high > resolution on a large screen. Of course my old eyes aren't very good, > but I would think it would be difficult for anyone to see small > differences on the camera. > Paul > On Mar 10, 2008, at 4:38 AM, Dario Bonazza wrote: > >> 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 >> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above >> and follow the directions. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
