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<p>[QUOTE=&quot;-jeffB, post: 4641883, member: 27832&quot;]I&#039;ve been wanting to try an axial setup for years, but still haven&#039;t gotten around to it. There&#039;s a good chance I never will.</p><p><br /></p><p>I learned about optics from telescope-making books, where everyone was SUPER SUPER FUSSY about optical paths. Putting an extra sheet of glass in the path was something that you wanted to avoid if at all possible, and a <i>tilted</i> sheet of glass was right out. It would cause ghost images and other artifacts. When you&#039;re looking at a bright star against a pitch-black background, those are harder to ignore.</p><p><br /></p><p>You can make a beam-splitter from a pair of 45-degree prisms. One large enough for a DSLR using a macro lens would be <i>really</i> expensive. But for a cell phone... hmm.[/QUOTE]</p><p><br /></p>

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