Ah, the classic Telyt, I learned that many wildlife photographers in the manual focus era loved it because you could focus it much faster than a rotating focus. In my collection, I have the complete opposite but also much shorter tele lens: Canon's vintage 100mm f/2.0 Serenar with Leica's M39 threat mount. I still use it sometimes for street photography with a Canon 7 rangefinder, it's fun. It can be focused so precisely that I get suprisingly frequent in-focus shots even at f=2 (camera needs to be serviced, of course), but I have to screw and screw and screw - so the best thing is to pre-focus and work within that distance range (the classic way of doing street)... Well, the results are really rewarding, with a wonderful mix of vintage charm, great bokeh and a center sharpness that is much better than the lens generations before. All those vintage lenses are not up to today's sharpness, but with a nice film grain they can be wonderful.
Sorry to read that you had to quit wildlife! I am really happy that my wife shares the same interest, so we shoot side by side and enjoy the setting.