Aperture Masks
A nother little project I have been working on lately is making a couple of aperture masks for one of my telescopes. I've been using my Celestron 120mm refractor for planetary views. Well, actually, I purchased that telescope specifically for solar imaging but, at night, it is a decent telescope for planetary as well as lunar views so this is the telescope I currently use for planetary observing. I'd like to eventually get a telescope with a much longer focal length for planetary astronomy but this telescope will do for now. I'd like to eventually purchase a longer refractor telescope for planetary astronomy but I might settle for a Cassegrain telescope instead. For now, I'll be using this Celestron 120mm refractor with a 1000mm focal length. This 120mm refractor is an achromat so there is a lot of chromatic aberration on planetary views. I added a Baader Contrast Booster to the front end of my diagonal and that has helped cut down most of the chromatic aberration