OK I'll throw in a comment based on my experience as far as enlarging lens's are concerned. Having tried a number of Nikkor's 50mm 2.8 and 80mm 5.6 and Focotar of various focal lengths and versions. The Focotar is the perfect enlarging lens for 35mm format, the 40mm for instance delivers a sharpness and contrast that I appreciate. It is capable of picking out the details in the negative and producing what I consider is an honest print, for I'm not waylaid by technical lp/mm and all that, my negative is projected as is nothing more and nothing less. It a personal comment based on my experience and I'm sure may would disagree.