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Hi Barry,
I see you only have 33 posts. Welcome to the forum.
Gain varies roughly linearly with ISO. Although this relationship can break down when some manufacturers switch from amplifier gain to digital gain at certain point on their ISO range.
You didn't specify the ISO so nobody can answer your question.
I think I've read that all Canon sensors have the same characteristics regardless of model, age etc. Makes you wonder what their R&D dept are doing??
The consensus is that all models have a gain of -
~1 at ISO 800,
therefore
2 at 400,
4 at 200,
8 at 100
0.5 at 1600
0.25 at 3200
0.125 at 6400
etc.
But this is all just based on my recollection of hearsay.
Most of this type of stuff is posted somewhere on line. Before posting a question, it's always worth just using a search engine and search for it yourself. I'll bet someone somewhere has measured and posted the gain data for your camera.
The IIS community resource though helpful is much smaller that the world wide web and you are going to be waiting and hoping someone here has the info you need when you can probably easily find it yourself.
Cheers
Joe
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