[ATM] What filters best for a

[artbianconi@blast.net]

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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