Used Antlia ALP-T f/2 High Speed Dual Narrowband H-a (5nm) & O-III (5nm) Filter - 2" Maksutov see the full compatibility list

see the full compatibility list in the product description and the measuring instructions on the FAQ tab

000 including 220 of the best deep sky and solar system objects Software Celestron's Starry Night Special Edition Software

Magnification 20x Objective Lens Diameter 80 mm Lens Coatings Fully Multi-Coated - XLT Coatings Angular Field of View 3

made exclusively for our CGEM and CGE Pro mounts

Used Antlia ALP-T f/2 High Speed Dual Narrowband H-a (5nm) & O-III (5nm) Filter - 2" Maksutov see the full compatibility listCondition: This is a used Antlia ALP T 2" Dual Narrowband (5nm) filter in very good condition. The optics are relatively clean, with only some minor dust spots, and the body is unmarked. This filter is the high speed (f 2) version. This comes in its original jewel case. Description ALP T Dual Band 5nm Ha & OIII Highspeed Filters # ALP T 2 HS are further optimized to work with high speed imaging systems by shifting slightly the passband and center