The SMC Takumar 6×7 90mm f/2.8 Leaf Shutter (LS) is a unique normal prime introduced in 1971 for the Pentax 6×7 medium format system. It was the first lens in the lineup to feature a built-in leaf shutter, enabling high-speed flash synchronization up to 1/500 sec—a major advantage for studio and outdoor fill-flash work. This lens was produced until 1980, when it was replaced by a non-leaf-shutter version. Optically, it uses a 6-element - 5-group design with Super-Multi-Coating (SMC) and a 5-blade automatic diaphragm. It stops down to f/22, focuses as close as 85cm, and delivers 0.14× magnification. It uses a 67mm filter thread (screw-in or bayonet), weighs 610g, and measures 91.5 × 63mm. The lens includes a U/S lever to toggle between “Usual” and “Special” modes, a shutter speed ring (1/30 to 1/500 sec), a flash sync terminal, and a cable release socket for triggering the leaf shutter independently. It ships with a metal bayonet cap, and was often paired with a dedicated close-up filter (S82) for improved near-focus performance.

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Release Date: 1971
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