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Kit includes: #8, #47, #82A, ND-13 filters Celestron color filters are mounted in black anodized aluminum cells with the
Kodak Wratten Series Number individually engraved, and come available in 4 assorted kits packed in plastic cases. The cells of
each filter are double-threaded, so they can be stacked (piggybacked) in various combinations. This allows you to create different
color combinations and transmission characteristics, or to have the same color characteristic, but with a lower transmission. When
stacking color filters, the effective transmission of the combination you create is equal to the product of the spectral
transmission of each of the filters used. Eyepiece filters are an invaluable aid in lunar and planetary observing. They
reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce
irradiation and lessen eye fatigue. Celestron's filters are made of high quality, solid plane parallel glass with excellent
homogeneity. They're anti-reflection coated to prevent glaring and ghosting. All eyepiece filters are threaded to fit
Celestron's, and most other manufacturer's, 1.25" eyepieces, and offer a full 26mm clear aperture.
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