TTArtisan's ultra-fast manual focus portrait prime for Leica M with f/1.25 aperture.
The TTArtisan 90mm f/1.25 is a manual-focus portrait prime for Leica M-mount rangefinder cameras, providing f/1.25 maximum aperture — among the widest available for M-mount — with rangefinder focusing coupling for accurate focus at wide apertures. The lens includes an integral tripod collar for lens-on-tripod mounting at the front element node — important for precise portrait framing at close distances. At approximately 1,010g including the tripod collar it is one of the heaviest M-mount lenses available.
The optical design uses 11 elements in 7 groups, including high-refractive-index elements. Ten aperture blades produce smooth, rounded bokeh. The 77mm filter thread requires a large-format filter set. At approximately 1,010g including the integral tripod collar the lens is substantial for M-mount use. Minimum focus distance of 1.0m — longer than most M-mount portrait primes. Focus is fully manual with rangefinder coupling for accurate focus via the M body's coupled rangefinder mechanism. No autofocus.
The f/1.25 maximum aperture provides subject separation and low-light capability beyond f/1.4 M-mount alternatives. At 1.0m minimum focus distance and f/1.25, the depth of field for portrait framing is very shallow — the rangefinder coupling is essential for accurate focus at this aperture. The 1,010g weight is significant for an M-mount lens; the integral tripod collar enables tripod-mounted portraiture without camera-body-to-tripod threading. Manual focus via rangefinder coupling is the standard M-mount workflow.
On the used market the TTArtisan 90mm f/1.25 is available at third-party M-mount portrait prime pricing. Condition checks: rangefinder coupling accuracy at several focus distances (confirm the rangefinder patch aligns with the focus ring indication), aperture blade operation through f/1.25 to f/16, tripod collar thread, and 77mm front element for marks. Compatible with all Leica M-mount rangefinder bodies including M10, M11, and earlier M9/M240 series.