Re: [APML] New SBIG Cameras

[Aplanatic@aol.com]

In a message dated 4/9/2003 1:48:34 PM Eastern Standard Time, rcorlan@pcnet.ro writes:

 
> OTOH, one should carefully consider the higher noise and Dark current of 
> the KAI sensors, which would mean that you generally need an exposure 
> roughy three times as long as on a KAF3200 to get the same SNR. At 650nm, 
> the ratio is even larger, maybe 5-6times.
> 
> Radu

This is quite misleading.  In practice, photon shot noise from the sky background almost always dominates the total noise, not the dark current or readout noise.  In typical situations the exposure needed to achieve the same SNR will not change much at all.  There are exceptions.

-Dave Rowe-

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