SonyUserforum - Gibt es hier echte Maenner? Backfocusproblem do it yourself)

AGD · 06.01.2006, 17:43

Nach ausgiebigen Tests bin ich draufgekommen, dass meine Kamera bei 85mm 1.4 einen leichten Backfocus zeigt. Nach recherche im www habe ich herasugefunden, dass man angeblich selbe Hand anlegen kann. Auswirkungen auf Garantie etc sind klar. Wer hat hier Erfahrung?

Zitat: Users debating this issue in another forum started looking at how the camera was assembled, offering theories on what was going wrong. One user figured out by looking at the CCD with the mirror locked up that 3 screws at the bottom of the camera controlled CCD alignment.

A Russian 7D owner with a backfocus problem (with his 50mm f/1.4) decided to experiment to see if he could fix his camera without the need to send it in for service.

He removed the rubber from bottom of the camera, put on a 50/1.4 lens (which he reported was absolutly unusable before due to the Backfocus problem), took a 1.5 mm hex driver, tripod and adjusted it. He said it took a total of about 15 minutes.

He said all he had to do was turn all 3 screws a quarter of a turn clockwise and it fixed it.

He also posted before and after photos showing how the problem was fixed (backfocus in photos before, no backfocus after). This 7D owner reported that his other lenses worked perfect. He said the has the Sigma 18-125/3.5-5.6, Minolta 28-85/3.5-4.5, Minolta 70-210/4, and Sigma 28-70/2.8.

This is not unusual (50mm f/1.4 with backfocus on this model, with other lenses working fine).

I would not attempt to fix a backfocus problem yourself (unless you don't have any other option). I was simply pointing out that I don't think it's a very big issue (a trip back to KM should solve it, *if* you get a camera with the problem). They would have the equipment and expertise to properly calibrate the camera (versus you trying to do it via trial and error).

Backfocus issues are not always the camera either. A lens can be out of calibration. It's a good idea to send both lenses and camera into a manufacturer (KM, Canon, etc.) if you have a backfocus or frontfocus issue. Users of 3rd party lenses sometimes send their lenses to the respective manufacturers for calibration, if it appears that the lens (versus camera) is at fault. KM would probably not try to calibrate a camera to a 3rd party lens (speculation on my part).

06.01.2006, 17:43	#1
AGD Registriert seit: 29.12.2005 Ort: Guadalajara, Mexico Beiträge: 335	Gibt es hier echte Maenner? Backfocusproblem do it yourself) Nach ausgiebigen Tests bin ich draufgekommen, dass meine Kamera bei 85mm 1.4 einen leichten Backfocus zeigt. Nach recherche im www habe ich herasugefunden, dass man angeblich selbe Hand anlegen kann. Auswirkungen auf Garantie etc sind klar. Wer hat hier Erfahrung? Zitat: Users debating this issue in another forum started looking at how the camera was assembled, offering theories on what was going wrong. One user figured out by looking at the CCD with the mirror locked up that 3 screws at the bottom of the camera controlled CCD alignment. A Russian 7D owner with a backfocus problem (with his 50mm f/1.4) decided to experiment to see if he could fix his camera without the need to send it in for service. He removed the rubber from bottom of the camera, put on a 50/1.4 lens (which he reported was absolutly unusable before due to the Backfocus problem), took a 1.5 mm hex driver, tripod and adjusted it. He said it took a total of about 15 minutes. He said all he had to do was turn all 3 screws a quarter of a turn clockwise and it fixed it. He also posted before and after photos showing how the problem was fixed (backfocus in photos before, no backfocus after). This 7D owner reported that his other lenses worked perfect. He said the has the Sigma 18-125/3.5-5.6, Minolta 28-85/3.5-4.5, Minolta 70-210/4, and Sigma 28-70/2.8. This is not unusual (50mm f/1.4 with backfocus on this model, with other lenses working fine). I would not attempt to fix a backfocus problem yourself (unless you don't have any other option). I was simply pointing out that I don't think it's a very big issue (a trip back to KM should solve it, if you get a camera with the problem). They would have the equipment and expertise to properly calibrate the camera (versus you trying to do it via trial and error). Backfocus issues are not always the camera either. A lens can be out of calibration. It's a good idea to send both lenses and camera into a manufacturer (KM, Canon, etc.) if you have a backfocus or frontfocus issue. Users of 3rd party lenses sometimes send their lenses to the respective manufacturers for calibration, if it appears that the lens (versus camera) is at fault. KM would probably not try to calibrate a camera to a 3rd party lens (speculation on my part).

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