Have you read the specs of the MX7C camera,
it's QE with Filters is 70% from 470nM to 650nM. it's noise is in the
12e- range and a 90k well depth. The CCD is a Sony ICX249AK, These
camera's are producing great images. If your goal is photometry then
yes I agree with you I would not get a MX7C or any one-shot color camera
instead use a B&W with a set of BVR filters if you want to do it right.

If your goal is to take images and maybe some astrometry then the MX7C
is a great camera to go with (I'm getting one soon I hope). it cost is
great, features are great and if you want grayscale you can get it.

Soon as I have mine I will post results of the true dark current, gain
noise etc... but might be several more months

Doug


-----Original Message-----
Alain Maury
Sent: Friday, May 04, 2001 1:38 AM
Subject: Re: [M]: CCD purchase


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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