C
carbonmetrictree
Guest
I decided to calibrate my adapter plate last night after reviewing several images that were soft at f/16 and focused at infinity with an exterior of a building 50ft from the camera.
I was pretty surprised to find that my adapter required a 0.67mm shim to obtain critically sharp focus (0.15mm increase). Considering that ALPA is a company that is known for high tolerance equipment, would my adapter be fauty? If there is a visual difference with a 0.01mm shim adjustment, I would assume that this would not be a normal occurrence. (One of the reasons why ALPA has not produced a sliding back adapter was because of tolerance issues). I am also wondering if our digital backs all have a slight variation in depth, which could also be the issue for such a large adjustment. I was freaking out for a little bit, but after two hours of shimming, the camera is now happy again!
I was pretty surprised to find that my adapter required a 0.67mm shim to obtain critically sharp focus (0.15mm increase). Considering that ALPA is a company that is known for high tolerance equipment, would my adapter be fauty? If there is a visual difference with a 0.01mm shim adjustment, I would assume that this would not be a normal occurrence. (One of the reasons why ALPA has not produced a sliding back adapter was because of tolerance issues). I am also wondering if our digital backs all have a slight variation in depth, which could also be the issue for such a large adjustment. I was freaking out for a little bit, but after two hours of shimming, the camera is now happy again!