Mamiya Sekor Z 150mm f/3.5 - Mamiya RZ67-mount

The Sekor Z 150mm f/3.5 is a dedicated portrait-length lens for the Mamiya RZ67 system, offering an approximate 35mm equivalent focal length of 73mm. It features a five-element design that balances sharpness with a pleasing roll-off in out-of-focus areas. The relatively fast f/3.5 aperture assists with critical focusing on the ground glass and allows for effective subject isolation. When inspecting a used copy, ensure the internal leaf shutter is firing accurately across all speeds, as these can occasionally stick if left unused. SDS checks for signs of oil on the shutter blades and haze or fungus between the internal glass elements. The electronic contacts on the rear mount should be clean and free from corrosion to ensure consistent communication with the camera body.