Busch Vademecum
Year unknown·Camera
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About
Emil Busch's Busch Vademecum[1] is a lens kit in a casket that contains a set of different lens elements in rings, plus a lens barrel with inbuilt variable iris diaphragm. The user can put one lens element ring onto each opening of the lens tube, and later remove the lens elements to use another combination of elements instead. With this lens kit the user has a kind of variable lens, with just the inconvenience of unmounting, disassembling, reassembling and remounting for each change of lens foc