2" Skylight Filter For Schmidt-Cassegrains If you were to use only one filter, Skylight Filter/Dust Seal would be your most versatile choice. This general purpose, Wratten #1A filter improves color saturation and balance, increases visual and photographic contrast, helps to decrease glare in lunar and planetary observing, and penetrates atmospheric haze. It’s also an inexpensive way to protect your investment in quality optics. This filter threads onto the rear cell of Celestron C5'', C8'', C9.25'', C11'', & C14'', Meade LX90 (8''-12''), LX200 (8''-14'') telescopes, ETX series & many other SCT's to serve as an effective dust seal. By leaving the Skylight Filter/Dust Seal on when removing or attaching other visual accessories, you prevent dust and other atmospheric contaminants from entering the rear of your telescope. Needless to say, it’s much easier to clean a dusty filter than a dusty primary mirror, secondary mirror and corrector plate. The Skylight Filter/Dust Seal must be threaded onto the rear cell of the instrument before any other accessory is installed. The female end attaches to the rear cell of the C5'', C8'' & C9.25'', Meade LX90, ETX & other SCT telescopes and the Reducer Plate of the C11 & C14, Meade lx90 10'', 12'', LX200 8'', 10, 12'', 14'' series telescopes. All additional accessories mount onto the exterior/male threads. Availability: Usually ships the next business day Skylight Filter SKYLTFILTER 888.291.6577 To all who visit our store: Numbers 6:24-26 24 The LORD bless you and protect you; 25 the LORD make His face shine on you, and be gracious to you; 26 the LORD look with favor on you and give you peace. (CLICK) VISIT OUR DISCOUNT BIBLES & APPAREL STORE Copyright (R) 2004 SmartAstronomy, All rights reserved.