Optolong Variable Polarizer Filter 2 Inch 20226 Prism Glass Type Bak-4

Prism Glass Type  Bak-4

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Suitable for color CMOS and CCD cameras and modified DSLRs

Iit provides a brighter

This is presents many advantages over the older ST4 guide port method including ease of set up

Optolong Variable Polarizer Filter 2 Inch 20226 Prism Glass Type Bak-4Optolong 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