Used Celestron Oxygen III Narrowband Filter - 2" AVX Please refer to the diagram

Please refer to the diagram below to understand how ASI585MC/MM Air cameras match with various telescope image circles

Installation Steps

a cleaning cloth

This compact 17

Used Celestron Oxygen III Narrowband Filter - 2" AVX Please refer to the diagramThis 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,