Used Celestron 2" Mirror Star Diagonal, SCT (#93519) Finderscope the Filter cell has heavy

the Filter cell has heavy duty threaded inserts and nylon thumbscrews

com/tutorials/best-back-focus-length-solutions-55mm

and everything works

The Antlia V-series filters block the emission line around 589nm

the etalon is designed to transmit light at the Hα wavelength while rejecting all other wavelengths

Used Celestron 2" Mirror Star Diagonal, SCT (#93519) Finderscope the Filter cell has heavyCondition: This is a used Celestron 2" Mirror Star Diagonal for SCTs in fair condition with mostly clean optics. There are a number of dust spots on the mirror that we cannot remove. We have taken this significant condition issue into consideration in the pricing. Celestron has long since discontinued this model, so If you've ever wanted to try 2" eyepieces on your SCT, here's your chance to do it at a huge discount: Save big at only FORTY BUCKS! This