From: "Martyn, Andrew" 
To: "'Nicolas Delalondre'" 
Cc: "'atm{at}shore.net'" 
Reply-To: "Martyn, Andrew" 


Ideally the illuminated field should match the size of the film or CCD you
are going to use. So you need to decide what you are going to use to take
the pictures with and then work out the required illuminated field and thus
the diagonal size you will need to achieve it.

> -----Original Message-----
> From: Nicolas Delalondre [mailto:delalondre{at}bionatics.com]
> Sent: Wednesday, January 08, 2003 2:29 AM
> To: atm{at}shore.net
> Subject: ATM fully illuminated field
>
>
>
> Hello,
>
> I'm starting a 10'' mirror (F/D 4 or 5...) dedicated to
> astrophotography. What should be the fully illuminated field
> diameter ?
>
>

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