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1. Industar 22. Basically an external copy of an Elmar. but not actually optically an Elmar. $20-30, really usable for the price. Very nice if you want to carry around a rangefinder and want to slip in in your pocket. Because it’s collapsible, and it’s $20 so who cares if it gets a scuff?
2. Canon 50mm 1.4 ltm. Very low price for a sharp old lens. Probably sharper than any of the other 50s mentioned here so far.
3. Contax 45mm f/2 for G mount. Extremely sharp, as in literally one of the sharpest lenses in that focal length range ever made, $300