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Jupiter-21A has Sonnar optical design (4 lenses and 3 groups). All Jupiters have this design. The elements have a single coating and is one of the best Soviet telephoto lenses.
In 1973, the manufacturer changed to Optical Vologda and Mechanical Plant (VOMZ) and it was changed to Jupiter-21M. It was designed for the M42 system, added automatic preset opening, was modified to a thicker barrel and the lens became heavier 240 grams more, and the number of opening blades was reduced to 8. All this made the Jupiter- 21M shows worse optical performance over all in sharpness and contrast.
Language | Description | Url |
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![]() | Pentaxforum | https://www.pentaxforums.com/userreviews/jupiter-21m-200mm-f4-0.html |
![]() | Disassemmbling & Clean | http://forum.mflenses.com/jupiter-21m-200mm-f-4-disassembling-and-cleaning-guide-t75574.html |
![]() | Juzaphoto | https://www.juzaphoto.com/recensione.php?l=en&t=jupiter_200_f4 |
![]() | Lensbeam Review | http://lensbeam.com/obektivy/obektiv-yupiter-21a-4200-obzor-i-primery |