Just looked up a Cnet review
http://news.cnet.com/8301-11386_3-57...n-sensor-test/
On their tests the Ev drops from 14 at ISO-100 to Ev 10.5 at ISO-1600
I have the Mk: 11 which is slightly worse than this.
Despite this I will still probably go for 400-800 ISO as I feel I am only looking for a limited portion of the data unlike say galaxies where you have everything from no signal to oversaturated in the one image group.
But I am certainly open to correction on this.
Joe Cali would you mind telling us what ISO setting you recommend for corona images?
Brian Coote