Alain Maury a écrit :
>
>
> My own personal point of view (which may not be everybody's truth) is
> that colour CCDs use CCDs made for video cameras, i.e. not exactly low
> noise applications. Chances are some are even interline transfert CCD
> (loosing more than half percent of the useful surface of the detector).

Sorry, I meant 50% of half the sensitivity. Next time, I reread what I
write. :-)

> Plus each pixel is covered with a micro filter which of course takes a
> good deal of the light.
> Because of this they are much less sensitive than black and white (i.e.
> no filter at all) CCDs. Of course, when you want to do some photometry
> or colour imaging using one filter, the black and white CCD will loose
> sensitivity (much less light). But chances are it is a better CCD, able
> to deliver low noise (10e-), high signal to noise images, and overall
> the images you will be able to obtain, with a given exposure time will
> be better.
> The biggest problem I see is that doing photometry with such a CCD is
> impossible, whereas a normal CCD camera (i.e. black and white) will be
> able (using a filter wheel) to do colour imaging.
> I (again personal point of view) see direct colour CCD cameras more as
> toys to produce quick and dirty colour images than all purpose devices
> able to cover all the range of imaging (in fact excluding everything but
> colour imaging).
> Alain

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