| Brand | Unbranded |
|---|---|
| Type | Accessories |
Check the listing for details. 1.25'' Filter Variable Polarizing for Astronomy Monocular Telescope & Eyepiece. Condition: New. Listed at 19.99 USD. ### Polarizer Its working principle is to selectively filter light from a certain direction. By filtering out many polarized lights in diffuse reflection, the intensity of light in the sky is weakened, the sky is darkened, and the contrast between the blue sky and white clouds is increased.