Rare Vintage Metal M42x1 Extension Screw Mount Tube Set 1 2 3 Rings Zenith & Similar Cameras USSR.

Notable cameras produced for the M42 mount

• Zenit line of SLRs from the USSR and Russia (some models)
• Praktica SLRs from East Germany (not the B-Series)
• Pentax SLRs from Japan (some models, all before the Pentax K2 of 1975)
• Zeiss Ikon Icarex TM and SL-706
• Voigtländer Bessaflex TM (2003–2007)