[Frameworks] Bolex and Beaulieu lens mount inquiry

[Sam Wells]

Both C mount but for wider lenses 10mm - 50mm, you should use lenses (mostly
Switar) marked "RX" because with the Bolex reflex prism the effective rear
focal distance is different. (longer, called "in air" distance).

The Switar RX lenses are also overcorrected for spherical aberration and
astigmatism which are implications of passing the image through the thick
prism.


-Sam
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