rare lens This lens is NOT the same as M42 Sonnar 200/2.8, only for PB mount. It is (surprisingly) very similar to MD 200/2.8 lens' optical design. See > http://artaphot.ch/minolta-sr/objektive/174-minolta-200mm-f28 My original data was wrong, I should thank for the following information. (note: The last element was missing in my Pr200/2.8's optical scheme.) See > http://zeissikonveb.de/start/objektive/wechselobjektive%201980er/carl%20zeiss%20jena.html