For something very similar: <http://www.zig-align.com/> Regards, Roderick > Hasselblad used to sell a copying devise designed to make the film > plane and the subject plane precisely parallel. It was done with two > mirrors. One was placed at the center of the item you were copying and > the other was mounted on a lens flange in place of a lens and had a > hole in its center. The 1966 Hasselblad catalog has a picture of the > unit with the following description: > #40185 Linear Mirror Unit. "The Hasselblad linear mirror unit is used > in photo-copying when extremely accurate parallel alignment between > film plane and subject is essential. Using the linear mirror unit, > parallelism can be adjusted to closer than two minutes of arc. The > linear mirror unit consists of a lens flange mirror 40193 attached in > place of the lens on the Hasselblad 500C body and a reflecting mirror > 40207 placed on the subject plane.
