Mamiya Sekor rangefinder 48mm 1.9/1.7/1.5 lenses, a question.

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E Dinkla Senior Member • Posts: 2,475
Mamiya Sekor rangefinder 48mm 1.9/1.7/1.5 lenses, a question.

The fixed lenses of some of the Mamiya 35 rangefinder cameras have unusual optics.

For example the Mamiya Sekor F.C. 4.8cm 1.9 lens version of the 1958 Mamiya 35S or 35 S2 or 35 Crown or Executive cameras, is a 6 elements 4 groups design that is more related to a Plasmat than to a Planar double gauss design. Possibly later Mamiya fixed lens rangefinder versions with a 48mm 1.9 lens have the same optical design.

https://spiral-m42.blogspot.com/2016/02/mamiya-sekor-fc-48cm-f19-salvaged-from.html

BTW the F.C. should mean Fully Coated and does not relate to a 6 elements 3 groups design like the Olympus and other companies codes on the lenses' beauty ring . The 75mm 4/3 design of the Mamiya 6 folder also has F.C. so not related to the elements/groups.

The Mamiya Sekor 48mm 1.7 of the Mamiya Auto-Deluxe has a 7 elements 5 groups design. 7 elements is quite unique for a 1.7 lens. Most likely the Mamiya Super-Deluxe with the 48mm 1.7 has the same construction. The faster 4.8cm1.5 version of the Super-Deluxe however has a 6 elements 4 groups design. http://herron.50megs.com/rangefinder.htm shows the models but the elements/groups numbers I found elsewhere.

I have searched for lens diagrams of the 1.7 and 1.5 lenses but could not find any info like that.  Anyone who does have that information?

Met vriendelijke groet, Ernst
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