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Binning is useful at times.
1. When you want less noisy colour and time is limited.
2. Seeing is not so great.
3. You use it for Ha or O111 for increased colour in your neb/galaxy image.
4. The image is not sharply detailed so its not as important to try to get maximum detail.
5. It increases full well capacity so star sizes can actually be tighter in some instances. ICX674 38 minutes would surely be oversaturated unless its dim Ha.
I use 1x1 when I want maximum detail even in colour and I have the time to get enough to smooth out the extra noise it has.
2x2 on say a 4.54 micron pixel makes it a 9 micron pixel and super high QE and full well which would work well on a long focal length scope.
I think this covers all the uses I am aware of.
Some CCDs do not do a proper 2x2 binning. The KAF8300 is only capable of 50,000 electrons when binned when it should be capable of 100,000 so its 2x2 binning is half of other cameras that do a true 2x2 and not limited in the electronics like the Sony ICX CCDs and I think most Kodak sensors (the KAF8300 may be the odd sensor out there).
Greg.
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