Olivon’s Variable Polarizing Filter screws into your telescope’s 1.25″ barreled eyepiece to dim the glare of bright objects, to better view targets like the Moon or planets. These high quality anodized aluminium, optical glass variable polarizing filters are designed to give you better control, to progressively reduce the amount of light entering your eyepiece, to match the glare of the object being observed, to increase contrast and visible surface detail. By making adjustments to the polarizer, you can vary the light transmission from 40% down to as little as 1%. This filter will not change the colour of the object being viewed and will prevent eye fatigue and loss of night vision. The Variable Polarizers are available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces.