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Re: Re: [APML] Petzval hot spot?

Yeah -- rub in that linear response...  :^)

Mike
> 
> From: Sean Walker <swalker@SkyandTelescope.com>
> Date: 2002/09/18 Wed PM 01:14:34 EDT
> To: astro-photo@seds.org
> Subject: Re: [APML] Petzval hot spot?
> 
> using proper flat frames, all these hot spot issues disappear using
> CCD's. But of course, we're talking about film here ;-)
> 
> Sean Walker
> 
> 
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