fairly small size as a 90mm lens, and can focus to 0.61m which is very
nice but the lens does not have distance marker on the barrel (220g)
I attached the filter ring made from 49->52 step up ring, ALPA lenses
do not have filter thread, they have dedicated (now expensive) hoods.
Optical design > http://www.flickr.com/photos/alf_sigaro/3113408847/
Very typical Sonnar type