[sac-forum] Re: Étendues Big and Small

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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