SMC PENTAX 67 LS 6x7 165mm f4 Prime Telephoto MF Lens

This lens is the Leaf Shutter (LS) 165mm lens for Pentax. Without the LS lens, the shutter sync on the Pentax 67 is around 1/15th or 1/30th of a second. 

The LS mode allows using high-speed flash sync with a shutter speed ranging between 1/30 ~ 1/500 sec. When shooting in this mode, “U/S” lever on the lens should be set to the “U” position for “Usual” mode and the camera’s shutter speed dial to 1/8 sec or less while the leaf shutter dial – to the desired speed. Next, the leaf shutter needs to be cocked and an X-sync cable connected to the flash terminal of the lens for high-speed sync. It is crucial to cock the leaf shutter before each shot. Otherwise, only the camera shutter will be fired, probably at 1/8 sec or slower, depending on your camera’s settings, and the lens will function as an ordinary lens.

The Pentax 67 is a SLR medium format system film camera for 120 and 220 film, producing images on the film nominally 6 cm by 7 cm in size, made by Pentax.

The Pentax 6×7 has a dual bayonet lens mount, and a wide range of interchangeable Takumar and later SMC Pentax 67-designated lenses exist. More than forty years after the original camera introduction a wide selection of lenses is still available, together with the latest Pentax 67II variant.