These Polaris® mirror mounts use a patented low-distortion design to secure the optic while minimizing sources of stress, ideal for applications that require long-term pointing stability, or where the potential of damage to the optic due to thermal fluctuations is particularly high. Thorlabs offers low-distortion mounts for Ø1/2", Ø19 mm, Ø25 mm, Ø1", Ø1.5", Ø50 mm, Ø2", Ø4", and Ø6" optics.