Collectable KMZ MC MIR 20M 20mm f/3.5 Ultra Wide Angle with original filters. Made after the Flektogon. It has no filter threads but comes with the rare original 3 filters that lack with magnets into the back of the lens. I like this lens. Fun to use and it gets great flares. Has a very vintage feel. It reminds me of 16mm films because of the vintage rendering. It focuses very close so you can get some dramatic shots and the bokeh is pretty cool, much in line with the early Flektogon design on which this is based.