With the StarGuy 1.25" Variable Polarizer filter you will view the moon as never before with enhanced contrast of lunar features and reduction of the overall brightness to reveal greater surface details. The StarGuy Variable Polarizer Filter will increase the contrast of the brighter celestial objects while dimming the brightness of your telescope. This StarGuy filter has a 4 to 50% transmission, making it the perfect filter for enjoying long hours touring the moon. Polarizing filters can also be used to see planets during the day, especially when they are 90 degrees from the Sun's location in the sky.