Re: [APML] New North American Nebula

[Alan Voetsch <critter12952@yahoo.com>]

--- Alan Brent Jordan <aljordan@gwi.net> wrote:
>This is the first
> nebula shot I have
> taken using a Hutech IDAS LPS filter. 

Hey Alan,

Great shot of the NA Nebula.
I've been considering adding a light pollution filter
to the optical train on my TV-85. I'm wondering though
how much light fall off is there due to the filter,
or, in other words, how much did you increase the
exposure time? 

Alan

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