Leica's vintage telephoto — the Telyt 200mm f/4 for M-mount with Visoflex required.
The Leica Telyt 200mm f/4 is a vintage telephoto for Leica M mount that requires the Visoflex reflex housing for practical focusing — the rangefinder cannot couple accurately at 200mm. The Telyt designation indicates Leica's telephoto line. At 200mm f/4, it provides useful reach for the M-mount system.
Optical performance is decent for the era. Sharpness is respectable. The f/4 aperture provides adequate speed. The Telyt requires the Visoflex SLR adapter for ground-glass focusing — the rangefinder coupling is impractical at 200mm. The Visoflex converts the M camera to SLR-style viewing for telephoto and macro work.
Leica M mount — requires Visoflex for practical use. Weight varies. Build quality is classic Leica precision. The Telyt series was Leica's telephoto range for M-mount. The Visoflex adds significant bulk. On digital M bodies, live view can replace the Visoflex for focusing.
Available at moderate Leica prices. Check clean optics and smooth focus. Requires Visoflex for film M bodies — live view works on digital M. A vintage Leica telephoto with practical limitations. The Visoflex requirement adds complexity. On digital M bodies, live view makes the Telyt more practical than on film.