why only 51200 ISO while 1DX has 204800? i can't believe their sensosr has 2 steps difference in sensivity.
reading your forum name I understand you are doing astrophotography. I would like to have a camera like that, but maybe they just differentiate it by cutting the high ISO down to 51200. If these are very usable I guess that's plenty for me as a low light "amatog". I guess they can do this by firmware, right?