Celestron colour 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 colour combinations and transmission characteristics, or to have the same colour characteristic, but with a lower transmission. When stacking colour 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 for lunar and planetary observing with any telescope. 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.
Kit includes: 21, 80A, #15, Polarizing filters in 1.25"
