Re: [APML] Orion Short Tube 80

["Takoyaki" <nmontec@libero.it>]

Hi Frank,

I personally do not own one, but from what I've heard, fast f/ratio achromat
suffer quite seriously from blue region being out of focus so you definetely
need a "minus violet" like filtre.
>From a vignetting point of view than I'm sorry but can't help you much in
that. Hope someone else can give us some info regarding that.

cheers
Nicola
----- Original Message -----
From: Frank Barrett
To: Astro-Photo@seds.org
Sent: Monday, October 20, 2003 7:40 PM
Subject: [APML] Orion Short Tube 80


Does anyone on the list use the Orion Short Tube 80 for AP?  Any problems
with vignetting on a 35mm frame?  As an achromat would I need a minus violet
filter for film?

TIA,  Frank
http://celestialwonders.com




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