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Hi Greg,
I have never used my Canon 5D for astronomy. The tonal graduations on these new chips are really awesome to me. At ISO 1600 shots taken in Cathedrals (and the Mosque in Cordoba Spain) showed more detail than I was seeing with my naked eye.
Using a Canon D60 in 2002 for solar prominences was the only time I have used a DSLR for Astro use.
If ISO 1600 cut the dynamic range to 1/16 of what is possible you would expect pretty ordinary results I would think. I have always assumed it was a matter of the amplifier factor applied to the basic image. I know if I increased the Canon D60 to ISO-800 I got visible noise but cannot see any apparent noise in the 5D at ISO-1600.
But this was all an assumption on my part and something I will have to resolve before our SE.
For flares etc the ISO can easily stay at 100 but for corona images having the highest clean ISO setting has distinct advantages.
Thanks for the input, I will try and further check this out.
Brian Coote
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