M29.5x0.5 adapters

Adapters with M29.5x0.5Adapters with M29.5x0.5 therad thread.

Such a thread is used to mount a front and rear lens cells to size #0 shutters (Compur #0, Copal #0, Copal Press #0, Prontor #0).

Also, some lenses have a filter thread of this size.