Lumicon Oxygen III (OIII) Filter - SCT Rear Cell - (Preowned) 11 mm Eyepieces there is also a Losmandy

there is also a Losmandy dovetail plate available for purchase

Using Celestron telescopes from his home in Texas

but slightly to either side is especially helpful when observing faint objects

H-Beta (486nm) and Oxygen III (496nm/501nm) emission nebulae wavelengths through

25" Eyepiece Adapter Specifications

Lumicon Oxygen III (OIII) Filter - SCT Rear Cell - (Preowned) 11 mm Eyepieces there is also a LosmandyThis 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