Mamiya / Sekor 50 mm f/ 2.8 Auto Lens

The Mamiya/Sekor 1:2.8 f=50mmAuto  is a normal prime lens for 35 mm SLR cameras with the M42 screw mount. The lens is equipped with an instant-return aperture.
According to camerapedia.wikia.com the lens belongs to the 1st  series with the M42 mount, manufactured for Mamiya TL/DTL cameras. The series also includes:

• 28 mm f/2.8
• 35 mm f/2.8
• 50mm f/2.0 (TL/DTL-I/DTL-II)
• 55 mm f/1.8
• 55 mm f/1.4
• 60 mm f/2.8
• 135mm f/2.8 (TL/DTL)
• 135 mm f/3.5
• 200 mm f/4.5
• 200mm f/3.5 (I/II/III)
• 400 mm f/6.3

These lenses were also sold under the brand name Sears.

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