Quick Optical Note: For the last 9 months I’ve been alternating back and forth between using the ZM Biogon 35 and the 50 Hexanon. I’ll stick one on the camera and leave it there for a month or two or three, and then, when my mood changes, switch to the other. One of the interesting outcomes of this is the cycle of surprise - as in “Wow, that lens is really good” - that comes when switching back to the other one. After going through this a couple of times, I’m fairly comfortable with saying that the Biogon is the better of the two. Both are excellent, but the Biogon just seems more consistently snappy and three dimensional. Despite my preference for the 50mm focal length, if I had to choose one lens, I think it would have to be the Biogon. Of course, with the long contrasty days of summer coming on, the slightly duller Hexanon may retake the lead.