Sky-Watcher Variable Polarizing 2" filter

These high qualities anodized aluminium, optical glass variable polarizing filters are designed toreduce the amount of light entering your eyepiece. When observing bright objects such as theMoon or certain planets, you can progressively dim the view to a level according to your needs,whilst increasing contrast. You can also reduce the glare and increase the amount of detail thatcan be studied. The light transmission can be varied from 40% down to as little as 1%. The filterwill not change the color of the object being viewed and will prevent eye fatigue and loss ofnight vision. Each filter set consists of two polarizing filters, one of which can be rotated in itscell to adjust the brightness. The filters, used as single elements, can also be used for daytimeterrestrial use for reducing sunlight glare from lakes, oceans, window glass and etc.The Variable Polarizers are available in two sizes, threaded to fit either standard 1.25” or 2”astronomical eyepieces.Recommended for viewing brighter objects.