Optolong Variable Polarizer Filter 2 Inch 20226 You can progressively dim the

You can progressively dim the view when observing a bright object

Suitable for color CMOS and CCD cameras and modified DSLRs

unsurpassed ease of use

Prism Glass Type  Bak-4

Optolong Variable Polarizer Filter 2 Inch 20226 You can progressively dim theOptolong Variable Polarizer Filter 1. 25 A variable polarizing Moon filter consists of two single polarizing filters coupled together. One of these has threads to attach to the bottom of eyepieces or other threaded adapter barrels, and the second filter can freely rotate over 360 degrees, thus allowing you to control the brightness of the image over a wide range. You simply rotate the lower filter until the image brightness is pleasing and comfortable