Quote Originally Posted by Alan Klein View Post
The OP is scanning 5x7. There are no holders for that size. So he has to scan on the glass platen and/or use a wet mount holder and use the second V850 lens. It is not as sharp nor does it allow as high a resolution as the regular lens used with film holder scanning for 35mm, medium format and 4x5. I don't know what effect that would have on any of the advice that he's getting here. But 5x7 gives him less options.
The BetterScanning frame/holder has, according to the website, a useable scanning area of 225 mm x 145 mm (8.85" x 5.71") that can be used with the high resolution lens.
So you should be able to work out a solution for 5x7 and the better resolution.