Hi Steven,
I have one of those 150mm Hermagis Eidoscope casket setx and I mounted mine in a Compur shutter that came with a Carl Zeiss 150mm f4.5 Tessar lens. Perfect fit. Using this to shoot on MF digital. I'm more comfortable with the 6x9cm spec ... 9x12cm is a vignetting stretch ...
Rudi A.
Bookmarks