Orion 5560 1.25-Inch Variable Polarizing Filter The Orion Variable Polarizing eyepiece filter acts like a dimmer switch for your telescope Finer control of the image brightness compared to a standard fixed-transmission telescope eyepiece filter for optimal performance Adjust the amount of light transmission from 1% to 40% by rotating the eyepiece filter housing Consists of two high-grade glass polarizing filters in an 1.25" rotating anodized aluminum cell