The Leica R system was made from 1965-2009 and the Leica R3 and following cameras were film SLR's. There are lots of lenses available S/H and these vary in price from pretty expensive to very cheap. I bought the two above a few weeks ago for under £200 each and while cosmetically they leave something to be desired, optically they are in very good condition. Manual focus only of course, above they are fitted to one of my Leica T (Typ 701) cameras via a Novoflex adapter. They are a 135mm F2.8 and a 28-70mm F3.5-4.5. I was looking for lenses to use on a Leica SL (Typ 601) that don't need a team of sherpas to carry about and I thought I'd try these out to see what they are like. 

And both lenses prove that 'lenses designed for digital' is the total BS I always knew it was. Both lenses are so old that they were designed and manufactured before digital existed and they are both sharp across the frame and CA and fringing free. A good lens is a good lens no matter what it was designed for. I have used them on my Leica T's and my Canon 5Ds, which I still have due to lack of enthusiasm to take it off my hands at the price I want from ebay buyers. An interesting and relatively cheap way to 'get into' Leica as there are adapters available for most mirrorless cameras. Below are some images shot with the lenses. 

Above shot with Leica T (Typ 701) and 28-70mm zoom

Above shot with Canon 5DS and 135mm lens