Celestron's Moon Filter is an economical eyepiece filter 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 and the transmission is about 18%.
Every experienced lunar observer knows that using a proper lunar filter can be like adding a dimmer and contrast switch to your telescope's eyepiece. See more details - more comfortably! (You just might find yourself using this filter to help display the phases of Venus and crack bright, close double stars!)
Celestron Product Number: 94119-A
Moon and Neutral Density
Reduce glare and increase contrast of the Moon with the Celestron 1.25-inch Moon Filter.
Also useful for extra bright planets as well as terrestrial viewing over sand or snow.
Threads onto most 1.25” eyepieces in seconds.
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