Celestron Origin Nebula Filter - 93669 Tele Vue Eyeguard Extender you can buy the base

you can buy the base separately

Venus doing her phases

EQ Head Weight w/o Counterweight Shaft:  47lb

9um square pixels

without any input or output fittings

Celestron Origin Nebula Filter - 93669 Tele Vue Eyeguard Extender you can buy the baseNebula Filter & Holder for Origin Telescopes! Take advantage of the innovative filter holder built into the design of the Celestron Origin Nebula Filter and experience better contrast when viewing emission nebula like the Orion Nebula, the Lagoon Nebula and dozens more, especially in areas with light pollution! This specialized filter blocks 0. 5% of wavelengths that cause light pollution while allowing H Alpha (656nm), H Beta (486nm) and Oxygen III