Re: [ATM] Solar Filtering

["Chris Dalla Piazza" <dalchri@hotmail.com>]

My preference is for the Baader AstroSolar film sold by Astro-Physics:
http://www.astro-physics.com/index.htm?products/accessories/solar_acc/astros
olar 

Similar to Mylar but more durable.  I made my filter out of poster paper and
tape.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
RC Stargazer
Sent: Friday, January 19, 2007 1:46 PM
To: atm@atmlist.net
Subject: [ATM] Solar Filtering

Hi, ATM'ers.

I'm looking to add solar filtering to my 8" (203mm) f/6 scope.  I built it 
as a travelscope with an octogon secondary, so it won't accept any of the 
off-the-shelf filter assemblies, and I'll have to build one.  Which brings 
me to two questions.

Question #1:
I've seen scopes with full aperature filtering, and others with a cover that

blocks all the sunlight except for a smaller filtered hole of about 3"-4" 
(75mm - 100m).  Which is better, or is it just a cost issue?

Question #2:
Where can I purchase filtering material at the best cost vs. value?

Thanks in advance!
- Dave

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