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Thanks Bob and Kev,

this clarifies everything perfectly.

Gene,
then why would this lens (the sironar-s 180mm) need a ring to work on the horseman 45fa? Also, I still dont understand why some lenses require recessed or extended lens boards. I am...

Hi,
Im looking to purchase a field camera and the issue of lens compatibility seems to be of great ambiguity. Im looking at the Wista 45rf and wondering if it is compatible with the Rodenstock...