The K20, K7 and K=t have a function which allows you to dial in the autofocus for each of your lenses, using plus and minus scales to correct for front or rear focus. Most camera/lens combinations aren't perfect matches right out of the bos. While other methods have been noted here, I generally use a scale printed on 13 x 19 paper. I place it on the floor. Then I mount the camera on a tripod and aim it at the center of the scale on a 45 degree angle. I shoot a frame with the lens wide open, convert it and check it on my monitor. if the line in front of the center target is sharper than the center, I know the lens is front focusing. If a line to the rear of the center is sharper than the center, I know the lens is rear focusing. Then I adjust the camera and repeat the test. It's a big effing pain in the ass, but worth the effort. Paul On Nov 2, 2010, at 9:38 PM, Tanya Love - personal email wrote:
> Erm, at the risk of sounding like a very unprofessional, professional, what > is focus adjustment? > > Tan.x > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of paul > stenquist > Sent: Wednesday, 3 November 2010 11:17 AM > To: Pentax-Discuss Mail List > Subject: Re: K-5 here, high iso samples > > Thanks. I'll take a look. > Paul > On Nov 2, 2010, at 8:23 PM, Rick Womer wrote: > >> That's pretty impressive! But my K7 has only 2200 exposures on it, so I'm > trying not to be =too= impressed! >> >> Are you acquainted with the moire-based, live-view-employing focus > adjustment technique? It made me stop dreading focus adjustment. >> >> http://www.northlight-images.co.uk/article_pages/cameras/1ds3_af_micoa >> djustment.html >> >> Cheers, >> >> Rick >> >> http://photo.net/photos/RickW >> >> >> --- On Tue, 11/2/10, P N Stenquist <[email protected]> wrote: >> >>> From: P N Stenquist <[email protected]> >>> Subject: K-5 here, high iso samples >>> To: "Pentax-Discuss Mail List" <[email protected]> >>> Date: Tuesday, November 2, 2010, 5:17 PM My K5 arrived a few hours >>> ago. My first thought was that it was defective and wouldn't >>> autofocus. As usual, I'd forgotten to set the diopter to "almost >>> blind." Once I realized that I was the only one not focusing, I shot >>> a few pics at ISO 6400 and 12800, just for grins. I converted them >>> from RAW with the default ACR settings. No additional sharpening. I >>> did increase the exposure a bit on the coke sign, since the largely >>> white background let it slightly under. Have yet to check exposure >>> for any necessary standard comp setting, but it looks pretty close. I >>> also have to check autofocus calibration for all my lenses. I hate >>> that job, but consider it a necessity with any new camera. Maybe >>> tomorrow. Anyway, ere are a few pics. >>> All are with the DA* 16-50. >>> >>> This is ISO 6400, f4, 1/125th: >>> http://photo.net/photodb/photo?photo_id=11890890 >>> >>> 100% drop of same frame: >>> http://photo.net/photodb/photo?photo_id=11890891 >>> >>> This frame is ISO 12,800, f4 1/50th. The camera focused in my nearly >>> dark basement: >>> http://photo.net/photodb/photo?photo_id=11890892 >>> >>> --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. -- 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.
