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Clive Gibbons
Mostly Harmless
Reged: 05/26/05
Posts: 13420
Loc: Oort Cloud
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Re: Prism Diagonal
08/28/08 10:14 AM
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Hi Jim.
Re. #1, yes that's my take.
I've also heard from another CN member with a TV-76, who reports it has similar color correction, which has been improved by using a diagonal prism. So, it's worth checking the other TV doublets for that, too.
Re. #2, It's my understanding that when converging light passes through a diagonal prism, a small amount of spherical aberration is introduced. I've read about this in other fora. It's a fairly small effect, especially if the objective lens is of long f/ratio.
I'm not an optician, so please don't ask me for the technical details... 
P.s.,
Thanks to Allister for posting the article!  
--------------------
A few telescopes of dubious value.
Understanding wife, two curious cats and one sadly departed.
"Semper ubi sub ubi"
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