Sensei Rear Lens Cap for Universal Screw Mount (Pentax M42) Lenses

The Rear Lens Cap for Universal Screw Mount (Pentax M42) Lenses from Sensei is a plastic lens cap fitted for the rear of Universal Screw Mount (Pentax M42) lenses. The rear lens cap is placed on the rear mount of a lens when it is not in use on a camera. The cap protects the rear element and lens mount from scratches, dust, water and fingerprints.