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Braided 90% OFC Shielding
2 lb Fluid drag system with smooth start and soft stop technology and balanced diagonal transitions Controls all-in-one-location design for fast
Close Hinged Bridge
which broadens the mount's versatility
Celestron Oxygen III (OIII) Narrowband 48mm Filter (Fits 2" Eyepieces) MCS 70186 Braided 90% OFC ShieldingBlocks Longer Wavelengths Better Highlights Nebulae The narrowband oxygen III filter yields high transmissivity through blocking unwanted longer wavelengths of light that aren't involved in your attempts to observe, giving higher contrast to your observing and photographic experiences. By isolating solely the two doubly ionized oxygen lines( 496 & 501nm lines ) emitted by planetary and emission nebulae while blocking the rest of the overall spectrum
