Another top quality lens by Leitz for the reflex range, now discontinued. Build quality was amazing in the day and clearly shows us the attention to detail that the Germans are capable of. I’ve had a 100/4 Macro for a while and pix from this can be contrasted with those I took with a Nikon 105/2.5 early ‘scalloped’ lens on Nikon F/F2. I began using Leicaflex SL bodies around four years ago. I noticed the Chinese were making adapters to enable the R series lenses to be used on modern digital cameras. I got cracking and bought as many of the lenses I could find at reasonable prices. This was one of them as I felt it was a good replacement for the 105/2.5. Although a stop slower, as I don’t take portraits inside or use flash (vulgar), the f4 is irrelevant. Outside in good light, this lens is first class for my purposes . Very occasionally someone accompanying the sitter will ask about my gear. When I say ‘Leica’ that’s enough. My gear dates from late 60s- early 70s and my 100/4 1980. My gear is digital as the negs (Tri-X) are scanned to disc.
So, if you have one or more of the Leicaflex trio, I suggest that you get cracking and buy some lenses before “digital Johnny’s “ get their hands on them. Prices have risen considerably since I started buying them in 2016.