The Jupiter 3 is a m39/ltm/l39 mount copied lens design from CZ's 50mm 1.5 Sonnar. It has a nice soft glow and wonderful bokeh shot wide open at 1.5 (it appears to not be coated, so there is little to no contrast without PP) the aperture ring has no click stops so i have to always check to see what it is if it accidentally gets knocked about. stopping down sharpens the image noticeably and cuts down on glare. it's a lovely lens to use compared to other 1.4 lens I have. this classic design has a signature that is perfect for portraits shooting. if you like this lens, you can also get a canon version or if (at 4 times the price) and a Carl Zeiss one (also $$$$$). the jupiter 3 is also expensive because of this association, but you can find some under 300$ if you're lucky. All shot on my EP3 with monochrome filter.