"David J. Littleboy" wrote:
...
*: I don't have a clue as to what this is. (Looking at the upper part of the
page, it may be that it's the eyepiece for the 35mm angle finder that makes
that angle finder work for 15mm lenses.)

38mm in 6x6 is about the same as 16mm in 24x24mm, so you can use a 15mm
viewfinder and mask it square.

-- Lassi