Celestron's Moon Filters are economical eyepiece filters for reducing the brightness of the moon and improving contrast, so greater detail can be observed on the lunar surface. The clear aperture is 21mm for the 1.25" filter. Transmission is about 18%.
Celestron Moon Filter (1.25") - Reduces Excessive Light Reflected From the Moon for Better Viewing
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Overview
Reduces the brightness of the moon and improves contrast
Description
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