Re: GPC-102ED by Vixen
From: Ed T (reply_at_thegroup.thx)
Date: 11/29/04
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Date: Mon, 29 Nov 2004 23:53:22 GMT
"RichA" <none@none.com> wrote in message
>
> Do me a favour; Put that thing up against a modern AP
> refractor. I did it with a Tak. What appeared to be
> really excellent, white images in a Tak suddenly looked
> alot worse.
> -Rich
Doublets, whether ED or fluorite, are not as well corrected in the blue
range (+/- 380-420 nm). Is it worth another $1k-2k to get a whiter image
from their 4" apo? For some folks, yes; others, no.
Ed T.
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