Celestron Oxygen III (OIII) Narrowband 48mm Filter (Fits 2" Eyepieces) Networked Audio Systems 8" (19 to 20 mm)

8" (19 to 20 mm) Weight 1

Material: Semi-conductive PVC

The Delta Muslin Mover Straight Track Section is a 6' straight rail section

Depth Rating 200' / 60 m Material of Construction Front Element: Glass

Impact Deluxe Varipole Support System - Silver (Pair)

Celestron Oxygen III (OIII) Narrowband 48mm Filter (Fits 2" Eyepieces) Networked Audio Systems 8" (19 to 20 mm)Blocks 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