Carl Zeiss Jena Flexon 50mm f/2.0-22.0

Lens categoryNormal
Vendor nameCarl Zeiss Jena
Type nameFlexon
Product year1953
Focal min (mm)50
Focal max (mm)50
Focus min (cm)50
Aperture max2
Aperture min22
Element(s)6
Diaphragm blades6
Filter size (mm)49
Carl Zeiss Jena Flexon 50mm f/2.0-22.0

The Flexon 2.0 and Pancolar 2.0 is essentially the same lens with different name. However, the notion that they are the same as the later Pancolar 50/1.8 is totally incorrect. While all of them are optically a Planar deviced 6 element in 4 group configuration. The 1.8 Lens is optically different from the 2.0s

Both Flexon and Pancolar 50/2.0 are produced in Chrome with leatherette focsuing ring variation as well as black with leatherette focsuing ring. A small quanitiy of Pancolar 2.0 are also produced in what is termed the Zebra version

The Flexon was made in Praktina mount and a very, very small quantity in Exakta mount. Only very limited quantity were made in M42 mount

Flexon was made in Praktina mount regulary and in very small quantity for Exakta, no M42 mount Flexon was made, according to my experience and the Zeiss fabrication dates, compiled in Thiele’s Fabrikationsbuch Photooptik Carl Zeiss Jena! KR

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