Celestron - Eyepiece Filter Set 2 - 1-1/4 inch (#12, 25, 56, ND-25)

Kit includes: #12, #25, #56, ND-25 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.