zenith practika fit m42 reverse ring to 49mm filter macro coupler
genuine pentax PK K M reverse ring to 49mm filter macro coupler bronze japan
pattern pentax PK K M fit reverse ring to 52mm filter macro coupler
kiron Canon FD fit reverse ring tube 55mm filter coupler for macro
later original pentax PK m42 mount adapter to fit m42 lenses to pk cameras
pentax zenith M42 T2 mount japan used
