ASA reducer/corrector for Newtonians - Astronomy Now Online

Astronomy Now OnlineASA reducer/corrector for NewtoniansAstronomy Now OnlineIn the scramble for wider, richer fields, the focal ratios of Newtonians have been evolving downwards. It is not unusual now to be able to purchase fast telescopes well below a previous 'norm' of about f/6; off-the-shelf instruments can be obtained ...

Share :

You may like these posts :

• 
  BACKYARD ASTRONOMER: Jupiter rising and Astronomy Day - Sierra Vista Herald
• 
  Women scientists: Tell Your Story and Inspire Others in Astronomy - The Planetary Society (blog)
• 
  Bad Astronomy Movie Review: Gravity - Slate Magazine (blog)
• 
  Family astronomy night at Calvert Library - Bay Net