蘇聯鏡 松纳光学结构 長焦大光圈 The Jupiter-6 180 mm f/ 2.8 (Russian: "Юпитер") - fast telephoto prime lens for a 35mm SLR .
Developed on the basis of optical design Carl Zeiss Olympia Sonnar 180/2.8 lens.

Jupiter-6 180 mm f/ 2.8
Format: 35mm SLR
Type: Prime lens
Focusing: Manual Focus (MF)
Lens mounts: M39, M39
First year of production: 1958
Optical design: 5 elements in 3 groups
Average price: $290
Specifications:
Focal length 180mm
Max. aperture 2.8
Min. aperture 22
Blades 18
Min. Focus (m.) 2
Filter Ø (mm.) 77
Weight (gr/oz)1470, 51
Length (mm/in) 139 , 5.5
more details see
http://allphotolenses.com/lenses/item/c_96.html

lens all function working well.
optic element bright, clean and clear.
great coating .
lens with KMZ factory leather case, front cover, real cover,
and one m39 to m42 adapter