Re: [ATM] Lens after diagonal?

[charlesmitchard@iinet.net.au]

> 
> >I don't  understand why you want to minimize the cone of light?    This is
> >only of value in long focus telescopes that are optimized for double star
> >splitting or planetary observations.   For those telescopes, you ususally
> >don't care about the fully illuminated field of view; all you need is a
> >sweet spot at the center.

What about the extra long path from the secondary to eyepiece when designing a 
binoscope?
Maybe there is a use here to minimise the secondary size. 

Is it possible to use a lens in the light path from the first secondary to 
convert the cone to a parrallel beam, then another lens to convert the 
parrallel beam back to a cone just before the second secondary?
If this could work the the distance between the two eyepieces could be varied 
without affecting focus.
Yeah, I know, a lot of surfaces, just thinking out loud.
Charles
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