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2025-08-07

Carl Zeiss Jena Triotar 80/4 (M40x1): Long-focus uncoated (non-T) triplet lens

Another of my triplet lenses.




The Carl Zeiss Jena Triotar 1:4 f=8,5 cm (85mm, f/4).




This is the uncoated (non-T) version with an M40x1 mount. According to one source, this lens was manufactured in 1945.

The lens has 3 optical elements in 3 groups (yes, triplet). Though it is a long-focus lens, it is not a telephoto lens. That's why the body is so long for an 85mm lens, resembling earlier 135mm lenses.




It has 16 aperture blades. The aperture ring is clickless (f/4-f/32). 

The filter thread is 40.5mm.

The Triotar 85mm is surprisingly sharp for such an old triplet lens.

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