RebelPPC a écrit :
>
> Alain Maury Wrote:
> > If you get a black and white CCD camera and a filter wheel, you will
> > be able to do colour images (deeper than with a direct colour CCD
> > images).
>
> Could you get a little more specific about what you said Alain? I am
> planning on getting a Starlight MX5 or 7C but after what you have just said,
> I might have to rethink.
>
> Regards
> FLag
> 8" f/10 LX-200 #845198
> 36:10:32.754 N
> 82:43:31.098 W

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).
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

View index by [date] [author] [subject]
Previous message: [M]: New Pics, Mike Fuller
Next message: Re: [M]: CCD purchase, Alain Maury
Next message in thread: Re: [M]: CCD purchase, Alain Maury
Previous message in thread: Re: [M]: CCD purchase, RebelPPC