Archived posting to the Leica Users Group, 2013/01/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Pretty simple: add or remove shims, focus on infinity, download image and examine at 100%, lather rinse and repeat. So you start with "thick" shims, and adjust to using thinner ones toward the end... On Sun, Jan 6, 2013 at 2:47 PM, Frank Filippone <red735i at verizon.net> wrote: > 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). > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- // richard <http://www.richardmanphoto.com>