Celestron Filters

The most common filter used in this hobby is a lunar or neutral density filter, which as the name implies, is used for observing the moon. These filters reduce the lunar brightness, revealing more detail and allowing for a more comfortable viewing experience. Observing the moon un-filtered with a telescope of five inches or more aperture is somewhat like shining a flashlight in one's eye. When the telescope aperture reaches eight inches this experience can be somewhat unpleasant.

Nebular and Planetary filters also have very specific target applications. Planetary filters work by blocking a specific part of the color spectrum, enhancing the remaining colors. Nebular filters block a large portion of the visible spectrum but allow specific wavelengths or spectral lines to pass. Some of the common spectral lines are hydrogen-alpha, hydrogen-beta, and oxygen-III. These spectral lines correspond with wavelengths emitted by hydrogen and oxygen atoms in excited states within what are know as emission nebulae. Nebular filters coax out a wealth of detail in these objects that might otherwise be lost against the background sky.

Celestron Eyepiece Filter Set #10

Celestron Eyepiece Filter Set - 1-1/4 inch (21, 80A, 15, Polarizing)

$39.95

Celestron Moon Filter - 1-1/4-inch

The moon is such a bright object that the view through even a small telescope can overwhelm your eye. The Celestron moon filter reduces the brightness and glare, increases contrast, and makes the lunar observing experience far more pleasurable.

$13.95

Celestron UHC/LPR Filter-1.25"

The Celestron ultra high contrast filter has improved contrast over the typical broadband filters and may be used for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.

$74.95