Quote:
Originally Posted by baileys2611
I've read only a little about well capacity. How does one go about calculating what your full well % is when taking a photo?
For instance, I'm going to be experimenting with a QHY10 in the near future (when it eventually comes on shore) and from their documentation, they state a 45ke- full well capacity.
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The camera gain should normally be set so that full well in e- is around 65,535 ADU (maximum 16-bit unsigned integer.) So, half well will be around 32,000 ADU, 2/3 well is around 43,600, etc.
If you want to do the calcs from first principles, just divide the number of e- by the gain to get the value in ADU. As an example, the full well for a KAF-8300 is around 25,000 e-. Typical camera gain for this sensor would be around 0.4e-/ADU. To target 50% of full well, that's 12,500 electrons. 12500/0.4 gives 31,250 ADU.
IIRC, the QHY10 has some magic gain and offset numbers that you can tweak. There's a relationship between what they call gain and the actual camera gain, but I don't think they are the same.
Cheers,
Rick.