Lens Models

Lens models are any interchangeable lens that has been marketed

Mamiya Sekor 50mm f/4.5

Summary
Manufacturer	Mamiya
Model	Sekor 50mm f/4.5
Mount	Mamiya RB67
Marketed	1970-1974 55 years ago
Optics
Zoom
Focal length	50mm
Aperture	f/4.5-32.0
Elements/Groups	11/8
Diagonal angle of view	82°
Negative size	6×7
Coating	Single coated
Optical diagram	Mamiya Sekor 50mm f/4.5 × Close
Features
Autofocus
Physical
Weight	920g
Filter thread	77.0mm
Misc
Link	https://rb67.helluin.org/lenses/50mm-f4-5/
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