Re: [APML] Dynamic Range of CCD

[lkt <tan@cox.net>]

Dave,

	The KAF3200 datasheet states that the dynamic range is 72-77dB or 3981
- 7079 and not 2300. Are you using a more stringent definition? Whatever
the definition of a minimum detectable signal, I would think that this
would be a clearly defined specification for CCD detectors. I would
presume Kodak would have taken this into account. 

http://www.fli-cam.com/downloads/kaf3200E.pdf


Loke


Aplanatic@aol.com wrote:

> On the upper end, negative film turns black and the CCD's well fills up.  These are roughly equivalent effects.  The ST-10E has a well depth of 77,000 electons.  I take, as the dynamic range of the CCD, the ratio of the well depth to the minimum detectable signal, i.e., 77,000/33 = 2300.  This is about 11 stops.  In practice, one should stay about a 1/2 stop away from the full well capacity to prevent blooming, so it's fair to say that CCD's have at least 10.5 stops of usable dynamic range in the short exposure limit.
> 
> For long astro exposures, things get much more complicated.  To some degree, film and CCD's are both limited by sky background. In this limit, it is the effective speed and linearity of the detector that is most important, and not its dynamic range.  But that is another topic for another day, perhaps?
> 
> Dave Rowe
> 
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>