The most common requirement for polarizers is to rotate them about the optical axis. Sometimes it is only necessary to set them at the correct orientation but in some applications, it is necessary to rotate the polarizer during use. OptoSigma rotators (holders) are available in two configurations. Micrometer driven polarizer holders offer high precision adjustment for the most sensitive polarization rotation applications. The micrometer drive version provides continuous 360-degree coarse adjustment and 10 degrees of fine micrometer adjustment. Our Lever type polarizer rotators are suitable for less precise applications. Simply grasp the lever protruding from the side of the holders to rotate and set the polarizer angle. Once in place the rotation can be locked by using the knurled clamp screw. Both types of holders are offered for 20, 30 and 50mm diameter or waveplates. Adapters are available for most common mica and calcite polarizers. The base of the holders are threaded 8-32 or M4 for use with our posts and post holder pedestal base mounting systems, and also industry compatible.