Re: [ATM] What filters best for a

["A. Suijkerbuijk" <a.suykerbuyk@wxs.nl>]

Hi,

As far as I know, photographic filters can be dangerous, they let pass 
ultraviolet and infrared rays. But perhaps it is possible to deposit a 
aluminum coating on a UV-filter
Or use the suggested Baader film.

Best wishes,
Adrie Suijkerbuijk
----- Original Message ----- 
From: <artbianconi@blast.net>
To: <atm@atmlist.net>
Sent: Saturday, December 18, 2004 3:00 AM
Subject: [ATM] What filters best for a


>I have an Estelle "Captain" Maksutov-Gregorian telescope. I love
> this little jewel. I keep it in the car all the time. It's a 14X
> device, a little too powerful for unsupported steady hand use so
> I am building a small binocular type mount out of a trio of
> crutches and some scrap in the shop.
>
> The 40mm aperture is threaded internally so I'd like to purchase
> some neutral density filters to fit. I figure that several ND
> filters, stacked one on the other, are safer than one filter of
> the same total value.
>
> Can anyone tell me the numerical value of a neutral density
> combination that will cut the light of the sun down to something
> safe? Need I be concerned with internal heat damage to the
> mirrors when using filters?
>
> Thanks
>
> Art Bianconi
> Milford, NJ
>
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