Archived posting to the Leica Users Group, 2013/01/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]That is fascinating.....! I always suspected it was not as easy as taking out of the box and shooting....... So how did you get the shims? And did you do the "calibration" yourself? Frank Filippone Red735i at verizon.net I found the GG not to be reliable on these technical cameras with medium format backs. I had been using the ground glass, which, though it looked sharp, often was not. These sensor are so remarkably flat that even being off 1/100mm will cause out of focus images. That's why Alpa allows users to shim the piece that holds the digital back onto their cameras to be adjusted with shims by 1/100mm. Other digital technical cameras allow you to adjust the focus point of each lens to the back. The manufacturing tolerance of the back's mounting plates are not within this range. The difference between my traded in back and this back was .1mm (the back had to be positioned .1mm closer).