Celestron 93624 Narrowband Oxygen III 2 Filter

• 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
• Country of Origin:China

• Item Reference: B0007UQNWM 0050234936248 050234936248