Kit includes: 21, 80A, #15, Polarizing 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, 1¼" eyepieces, and offer a
full 26mm clear aperture.
