Mamiya's telephoto for the 645 system — another listing of the Sekor C 210mm f/4.
The Mamiya Sekor C 210mm f/4 is a telephoto prime for the Mamiya 645 medium format system, similar to the Sekor N version listed under IDs 3598 and 3683. The C designation indicates an older optical version with multi-coating. On the 645 format, 210mm provides approximately a 130mm equivalent — a useful telephoto for portraits, wildlife, and compressed landscapes.
Optical performance is good for the system. Sharpness is very good when stopped down. The C-series designation indicates an earlier production version than the N-series but the optical quality remains solid. The large 645 negative produces detailed, tonally rich images at this telephoto perspective. Bokeh is smooth with the medium format advantage.
Mamiya 645 mount with leaf shutter on some versions. Filter thread is 58mm. Weight is approximately 560 grams. Build quality is solid professional grade. Manual focus with a smooth helicoid. The C designation predates the N series but both provide capable telephoto coverage for the 645 system.
Available on the used market at moderate prices — often slightly less than the N version. Check for smooth focus and clean optics. If a leaf shutter version, check shutter operation at all speeds. A good value telephoto for 645 shooters. The 150mm f/3.5 remains the preferred portrait option.