16 Aug
2011
16 Aug
'11
7:06 a.m.
One final note on refractive objectives. Our large astro-binos almost all use doublet objectives, albeit at relatively low powers, yet no-one ever seems to complain about uncorrected color in bino views. We're too busy enjoying the view! The short refractor can be a top-notch RFT. With this in mind, I may build my 6" f/5 Jaegers refractor first, out of all the lenses I recently purchased from Surplus Shed. As for long-focus refractors, I have a home-made 50mm f/20 refractor, built around a 50-year-old military surplus cemented doublet. This is one of the most fun telescopes I have ever used, having seen every Messier object and countless NGC/IC objects with it, from my light-polluted back yard. All with less than 2" of aperture.