The Rotary Optic Mount allows allows smooth manual 360° rotation of optics for easy relative angular positioning. An ideal alternative for expensive rotary translation stages, this rotary optic mount can be used for aligning prisms, beamsplitters, polarizers and other optical components using a 180° (90°-0-90°) scale with 1° increments. Construction is black anodized aluminum with a stainless steel lever. #52-573 and #52-574 include a 4" long stainless steel mounting post #59-000. #52-574 includes polarizing filter #52-557.