Scattered Thoughts . . .

T he other day, I went out to the shed in the rain to cut out a couple of aperture masks for my small 50mm guide scope.  I want to try to use this guide scope as an imaging scope for imaging the full disk of the sun.  I have previously worked out a potential configuration to do the same using my 72mm ED refractor but I want to compare the two and then continue to use the one that produces the best images.   I need these aperture masks because I need the guide scope's focal ratio to be in the f5 to f6.5 range.  Without these aperture masks, my guide scope is at f3.2 which is too fast for this particular use.  I'm using my Quark Chromosphere solar filter so I need the focal ratio to be between f4 and f8.  I'm thinking that closer to f4 might be better for capturing prominences while closer to f8 will be better for capturing details on the 'surface' of the chromosphere.  This surface isn't really a hard surface though...  it is a surface of plas...

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 chromat...