Leica's original R reach tele — the manual-focus Telyt-R 250mm f/4 (I), a long telephoto prime.
The Leica Telyt-R 250mm f/4 (I) is the first version of Leica's 250mm telephoto prime for the R reflex system. It gave R photographers longer reach than the 180mm lenses for distant subjects, and was later replaced by a redesigned second version. As the original design it can be distinguished from the later type by its barrel and construction.
This is a manual-focus Leica R lens with a 250mm focal length and a maximum aperture of f/4. It is a full-frame telephoto prime for the reflex line. Because the first and second versions differ in construction, buyers should confirm which version they are buying and verify the filter thread, tripod collar and cam configuration on the specific example.
The 250mm focal length suits wildlife, sport and distant subjects where the 180mm falls short of the needed reach. The f/4 aperture is reasonable for a telephoto of this length and allows some subject isolation. It is best supported on a tripod or monopod for steady framing of far subjects.
On the used market the first-version Telyt-R 250mm is a specialist reach lens, less common than the shorter primes. Distinguish it from the version II before buying, since the two differ. Check for internal haze, fungus and dust, confirm the aperture is clean and dry, and inspect the tripod collar and mount. Verify the cam setup for correct metering on your R body; a Leica R adapter enables mirrorless use.