Solomark 1.25 Inch 4pcs Telescope Eyepiece Color Filters Set 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. Solomark filters are made of high quality, solid plane parallel glass with excellent homogeneity. They anti-reflection coated to prevent glaring and ghosting. All eyepiece filters are threaded to fit Celestron and most other manufacturer 1.25 inch eyepieces, and offer a full 26 mm clear aperture. SOLOMARK 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. Package Include: 4 X 1.25 Inch Filter

Stackable filters for various combinations. High-quality, solid plane parallel glass. Reduce glare and light scattering. Perfect for lunar and planetary observation. Color eyepiece filter set includes No.12 Yellow, No.21 Red, No.80A Blue and No.56 Green.

Water Resistance Level: Not Water Resistant. Photo Filter Effect Type: Enhancing. Photo Filter Thread Size: 1.25 Inches. Material: Aluminum, Glass, Plastic. Brand: SOLOMARK. Manufacturer: SOLOMARK. Date First Available: December 9, 2014. Is Discontinued By Manufacturer: No. Best Sellers Rank: #25 in Telescope Filters. Customer Reviews: 4.3 out of 5 stars 163 ratings 4.3 out of 5 stars. Item model number: 4332013139. : B00QSOYZ9O. Item Weight: 2.08 ounces. Product Dimensions: 2 x 2 x 0.8 inches.