Manfrotto quick release plate lens mount_Other This is not a defect:

This is not a defect: the crystals dissolve readily and won't give you any grief

or pretty much whatever you can fit back there

A classic M42-mount Asahi Bellows-Takumar 100mm f4 lens designed for use with a bellows: this lens has no focusing system of its own

and while it's relatively stout

and I do not think that it is possible to use it without a tripod

Manfrotto quick release plate lens mount_Other This is not a defect:A Manfrotto quick release plate for select heads and accessories. This is not the standard 200PL, but it is compatible with many RC2 systems. What is it called? I am not sure! Standard 1 4 20 thread for camera mounting. Image is for illustrative purposes only. Actual item may differ slightly.