[sac-forum] Re: [sac-forum] Re: [sac-forum] Re: Étendues Big and Small

Tom., aw shucks you could have at least teased David and said you were contemplating a 40" :)) 

Clear skies
aj
----- Original Message ----- From: "Tom Polakis" <tpolakis@xxxxxxx> 
To: <sac-forum@xxxxxxxxxxxxx>
Sent: Monday, October 29, 2007 11:38 AM
Subject: [sac-forum] Re: [sac-forum] Re: Étendues Big and Small


No, David, I'm not going to follow your lead.

Tom

---- "david.fredericksen" <david.fredericksen@xxxxxxxxxxxxxxxxxxx> wrote:

Tom,
    Are you thinking of upgrading to something similar?  Just curious.

Clear Skies,
David

Tom Polakis wrote:
>At last night's meeting, we learned that Large Scale Synoptic Survey has >a large Étendue, which is defined as the telescope's light gathering area >multiplied by the field of view. The Étendue for the LSST is 319 m^2 >deg^2. 
>
>I became curious what the Étendue is for my 10" and Philips ToUCam when >it's at the same image scale of 0.2" per pixel. I calculate 0.0000480 >m^2 deg^2. 
>
>The Étendue of the LSST will be 6.6 million times larger than my backyard >setup. 
>
>Tom
>
>
>

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