Producer: Carl Zeiss Jena (DDR)
Model: Biometar MC
Focal length: 80mm
Max. aperture: f/2,8
Min. aperture: f/22
Aperture blades: 8
Min. focus distance: 1 m
Filter diameter: 58mm
Weight: 260 g/ 9,2 oz
Length: 51 mm/ 2 in
There were six versions according to information on this site: http://www.pentaconsix.com/zeissdes.htm
Please do not trust the many misleading Biometar picture samples found in the internet, notably on flickr. These samples are very often mushy, have so poor contrast, poor colors, I'm even often wondering how the photographers did them.
This lens has in reality amazing contrast and micro contrast. It is as sharp as other lenses in this range (compared to Tamron 72BB and Pentax M 2/85). Colors are superb. Handling is top. Get it.