| For 35mm Pentax K-mount bayonet and Ricoh XR/KR cameras only (where the lens rotates a quarter-turn and clicks into place). Not for Pentax 42mm screw-thread lens mount cameras (where the lens must be turned several times to attach to the camera body). Needed to connect your 35mm Pentax or Ricoh bayonet mount SLR camera body to a T-adapter or camera adapter for prime focus photography (full disc solar/lunar photography and terrestrial photography); to a tele-extender or camera adapter for eyepiece projection photography (planetary photography and close-up shots of the Moon); and to an off-axis guider for long exposure deep space photography. | 
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