Optolong Variable Polarizer Filter 1.25 EQM Windows XP/Vista/Win7/Win8 (not RT)

Windows XP/Vista/Win7/Win8 (not RT)

94mm diameter total CO including baffle (22% by area)

Highest Useful Magnification: 840 x

making them ideal for comet watching

Most altazimuth telescopes are designed primarily for visual use

Optolong Variable Polarizer Filter 1.25 EQM Windows XP/Vista/Win7/Win8 (not RT)Optolong 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