Leica's compact collapsible 90mm — f/4 Elmar in the smallest possible M telephoto package.
The Leica Elmar 90mm f/4 is a collapsible telephoto for Leica M-mount — the slowest but most compact 90mm in the M system. The Elmar designation indicates f/4. Some versions are collapsible — retracting into the body for extreme compactness.
Optically adequate — the Elmar f/4 is the simplest 90mm formula. Sharp from f/5.6. The f/4 aperture is slow for a portrait lens but adequate in good light. Manual focus with rangefinder coupling. Classic Leica rendering.
Leica M mount. Collapsible on some versions. Very compact — the smallest M 90mm. E39 filter thread on most versions. All-metal construction. Manual focus.
Available used at budget to mid-range prices — the most affordable Leica M 90mm. The collapsible design is charming but the slow f/4 limits subject separation. For Leica M users wanting 90mm coverage at minimum size and cost.