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

The heck with a 40" scope-- give me the 63cm CCD!!!!

Dick H


-----Original Message-----
From: sac-forum-bounce@xxxxxxxxxxxxx [mailto:sac-forum-bounce@xxxxxxxxxxxxx]
On Behalf Of AJ Crayon
Sent: Monday, October 29, 2007 1:44 PM
To: sac-forum@xxxxxxxxxxxxx
Subject: [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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