Archived posting to the Leica Users Group, 2013/01/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Correct, but it comes with shims loaded for the "average" calibration... On Sun, Jan 6, 2013 at 2:54 PM, Richard Man <richard at richardmanphoto.com>wrote: > 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> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Bob Adler