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Here I was typing away and I got timed out before I could send the reply. So I'll try again.
Basically I have a QHY12 CCD it is a 12 Mega pixel camera with 5 micron pixels its efficiency is only 50% at the green wavelength.
It takes 25 secs to download a high res colour image to the computer, in low res mono mode (used for framing and focus) it is almost real time but little detail.
To get a resemblance of the Carina or Orion Nebula's the shutter needs to be open for at least 10 sec's.
I have an 8in Skywatcher reflector, If I had a 16in mirror that time would reduce to 2.5 secs. If I had a Sbig camera with 85% efficiency it would be further reduced.
So for real time a CCD is probably not the answer.
Bill
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