Quote:
Thanks Alan,
It was more of a testing weekend. The wells on this camera are relatively deep, so I’ll definitely be trying longer exposure. That said, there is a trade off with CMOS between exposure duration and read noise that means you do well with relatively short exposures compared to CCD - I don’t fully understand that, a bit like my lack of understanding about gain, offset and readout mode. Many “knobs to twiddle” and much to learn!
DT
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Hi David,
I spent a bit of time investigating CMOS cameras
over the last few years but didn't get very far.
In your case it would have been interesting to take 4 of your 5 minute Ha frames
and stack them and stretch them -
then compare with say one 20 minute Ha frame.
I believe you're right and the CMOS cameras have too high a
read out noise to take long exposures.
It would be nice to see that demonstrated rather than a page
full of formulas such as here:
http://www.astrosurf.com/buil/CMOSvsCCD/index.html
cheers
Allan