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Carl Zeiss Jena Tessar (modified mount) 50mm F2.8 1Q 8 iris blades
Latest Review Posted Jupiter 21M 200mm F4.0
Used full aperture in my Astrophoto setup, it delivers astonishing pinpoint star images, vivid colours (maybe on the cool side); contrast is not the best, but if you cover with anti-reflecting black velvet a flat metallic plate inside the flange ring of the lens, contrast improves radically (see the photo of this mod, sorry for the poor quality...).
Apart dimensions and weight, performances are similar to the stunning Jupiter 37A (a lens that I consider one of the best Russian optical products ever), superior to many german Sonnars from which the optical scheme is derivated.
Bokeh is good (8 blades iris).
Weight, dimensions and M42 flange can be a minus if handheld, but not in my astrophoto piggybacked use, so I can only recommend it!


https://www.pentaxforums.com/forums/members/97068-biulazz/albums/10084-jupiter-21m-anti-reflections-mod/picture92547.jpg



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