• Backlash-Free Thrust Bearing Design
• Accepts Ø50.8 mm Optics up to 13.7 mm Thick
• Compatible with SM2 Lens Tubes
• One SM2RR Retaining Ring Included
• M4 Tap for Post Mounting

Our Ø50.8 mm RSP2C/M rotation mounts utilize two precision bearings for smooth, backlash-free rotation. The apertures are threaded with our internal SM2 threading to accept Ø50.8 mm optics. One SM2RR threaded retaining ring is included with each mount, which is used to hold an optic up to 13.7 mm thick.

The mount features a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. For calibration purposes, the scale on the RSP2C/M can be unlocked and rotated so that it can be aligned to the axis of an optic (i.e., fast axis of a waveplate). A top-located setscrew can be tightened to lock the rotation of the mount.