Lumicon Oxygen III (OIII) Filter - SCT Rear Cell - (Preowned) type-flashlights-and-laser-pointers The effective optical path length

The effective optical path length of the base T-2 Maxbright Diagonal is 54mm

4" Focuser provided you have the appropriate T-Ring to fit your brand of camera

true-to-life color

83x Reducer

tripod and accessories in this VIXEN telescope storage case

Lumicon Oxygen III (OIII) Filter - SCT Rear Cell - (Preowned) type-flashlights-and-laser-pointers The effective optical path lengthThis filter is used, in good condition. About the Lumicon Oxygen III (OIII) Filter SCT The renowned, original Lumicon OIII Filter narrow bandpass filter (11nm) isolates just the two doubly ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black background of space and the delicate photons of OIII light needed for