Re: [ATM] Advice on Solar scopes/observation

["tony gondola" <acgna@comcast.net>]

I like the idea of uncoated optics as it seems the safest soultion. I'm 
wondering though, if you're going to use the scope for imaging only, would 
just 2 reflections give enough attenuation in concert with the fact that if 
you're going after near diffraction limited images you'll be using a barlow 
to get out to around F/24.

Tony

----- Original Message ----- 
From: "Anthony Stillman" <atmer@flash.net>
To: "PaulG" <guardian@reaper.org>
Cc: <atm@atmlist.net>
Sent: Thursday, June 15, 2006 11:20 AM
Subject: Re: [ATM] Advice on Solar scopes/observation


> Paul,
>
> If you want to use existing equipment and/or want to
> use the equiptment for other purposes, I suggest you
> use a full aperture filter.  If you intend to have a
> dedicated scope then I suggest uncoated optics.
> You'll need three bare glass surface reflections to
> get the light level down to safe.  That means an
> uncoated primary, an uncoated preferably wedged
> secondary, and likewise tertiary.  Since the '70s
> there's been a design floating around that has been
> seen a lot.  It calls for a 45 degree angle mounted
> full aperture piece of partially aluminized plate
> glass over the front end of the scope.  It acts as a
> light filter, the secondary, and as a sort of safety
> in than if it breaks no light will get to the
> eyepiece.  I prefer all un-coated optics.
>
> Though I've never done this, many of the solar scopes
> I've seen, or been inside, have insulated tubes.  In
> my opinion it doesn't make much since if the full flux
> is ever in the tube, but if there's a Baader filter on
> the front, it is a good idea.
>
> Good luck.  I suggest you check the archive again and
> the net some more (web ring).  A lot of people have
> done this.
>
> Anthony
>
>
> --- PaulG <guardian@reaper.org> wrote:
>
>> Hello!
>>
>> I'm looking for somebody who's feeling helpful and
>> preferably who has experience building a scope with
>> the specific intention of observing the sun, or
>> modifying existing equipment for solar observation.
>> I'm hoping to build a 6" with a dedicated purpose
>> and there seem to be a few options available.
>>
>> If said person(s) could contact me off list I'd
>> really appreciate it! This isnt something I can
>> afford to get wrong!
>>
>> -Paul
>> _______________________________________________
>> ATM mailing list http://www.atmlist.net/
>>
>
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