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Re: Barlow ?

Subject: Re: Barlow ?
From: David Nakamoto
Date: Sat, 09 Sep 2006 05:15:05 GMT
Newsgroups: sci.astro.amateur
Terry A Haimann wrote:
For a 20cm sct, what would be a good barlow for splitting binaries? It
would need to balance performance with economy, I can NOT afford a TeleVue.
Terry
One thing I like about the short tubed barlows, which is why I got one, is that if you put it in the optical train with just itself and the eyepiece, you get 2x, but if you put a star diagonal between the Barlow and the eyepiece you get 3x. This little trick also works with imagers and film.

   --- Dave

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