True. I used Tim's chart for my last calibration, and it was easier than what I had been doing previously, which was comparing a single character. I'll have to try it in camera again. But I'll wear my reading glasses:-). Paul On Mar 10, 2008, at 9:28 AM, Dario Bonazza wrote:
> 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. -- 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.
