Used Celestron Oxygen III Narrowband Filter - 2" RACI all-in-one home observatory takes the

all-in-one home observatory takes the complexity out of traditional telescopes

continues the tradition of full-field sharpness with optimum aberration control

The Astronomik CLS CCD filter is recommended as a replacement for the Astronomik Luminance filter

The ZWO EAF

Used Celestron Oxygen III Narrowband Filter - 2" RACI all-in-one home observatory takes theThis is a 2" Celestron O III filter in excellent, clean condition. Comes in its original jewel box. The 2" OIII narrowband filter isolates the two doubly ionized oxygen lines (496 and 501 nm lines) Filter has ultra hard, vacuum deposited coating Eliminates un natural colored halos surrounding bright stars The 2" OIII narrowband filter isolates just the two doubly ionized oxygen lines (496 and 501 nm lines) emitted by planetary and emission nebulae,