This lens has good reputation as a Sonnar copy.
Little bigger than its brother Jupiter 8 50/2
You can find some usefull infromation on this lens and other Russian here
test at wideopen
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Topcon 135/3,5 RE Minolta Rokkor 500/8 Topcon 135/3,5 RE ROW Visionar 154/1,9
my wife's shot This morning, Merapi volcano erupted, see ashes in leaves Taken with EOS 650 + Lucky BW 100 film ...
Got this lens in ugly condition, fungus, paint loss everywhere, infinity achived but not same as letters written, aperture stuck wide open....