Sky Mentor 1.25" Variable Polarizer Filter - TA189 classic Imaging focal ratio with included

Imaging focal ratio with included coma corrector/reducer is f/3

ED glass elements

It can be purchased at the time of telescope acquisition or at any point thereafter

it's made for the business end of your optical devices

Angular Field of View 4

Sky Mentor 1.25" Variable Polarizer Filter - TA189 classic Imaging focal ratio with includedAdjust the brightness level of the Moon, Venus, and other bright objects with the Sky Mentor Variable Polarizer. A standard Moon Filter is similar to a pair of sunglasses. They work fine, but sometimes the scene is too dark or too bright, and theres not a lot you can do about it. A variable polarizing filter is much more flexible than a Moon filter. It allows you to set the percentage of attenuation by turning the top section of the two piece filter.