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2026-10-10 Mamiya/Sekor 28mm f/2.8

    
    There are times I make a mistake writing articles. This is one of them. I thought I had a finished story but when it came time to post it I found all I had were the basic details. I can’t just post that, so I have been doing some additional research.
    Initially I didn’t even know how I acquired the lens. I found I had bought it for $5. I must have been attracted by the “name brand”. Although it isn’t a Pentax or Nikon optic, I have had nothing but good experiences with Mamiya products.
    There have been at least four Sekor and Mamiya/Sekor 28mm lenses. The earliest Sekor variant had 7 elements in 6 groups. The SX variant (this one) has 7 elements in 7 groups and the later E version has 8 elements in 7 groups.
    The SX lens series was made for the Mamiya/Sekor SX cameras. There were four  cameras, the Mamiya/Sekor DSX 500 and 1000 SLR cameras of 1974 and the MSX 500 and 1000 cameras of 1975. This lens line was also used by the Voigtlander VS-L TM camera.


Mamiya/Sekor SX Auto 28mm f/2.8

Elements 7 in 7 groups
Close Focus 0.3 m (1 ft)
Introduced 1974
Weight 220 g (7.8 ounces)
Height 58 mm (2.3 inches)


Note:The “SX” mount has an additional metering notch on its 42 mm universal screw mount, so some screw mount cameras can have mounting problems. This can also apply to digital camera adapters. There are various ways you can modify the offending bits if you are handy with grinding and cutting tools. 
    It was considered one of the better 28mm lenses.

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