30mm 0.5X-M42 Adapter
The all-metal adapter is designed to fit the lens securely, yet can still be removed easily when not needed.
Male side - M42X1MM
Flange Height: - 1.5mm
Dia. of flange is 49mm
Schneider Enlarging Lens, Steinhel Munich Cassar 75 and any other part with male M30x0.5 standard.