1Ds3 ISO1600 = 1DX ISO12800
Exactly! I have to shoot indoor sports and never seem to have time to set up lights so I often have to shoot at super high ISOs. Most high school gyms in my area are extremely dark. I am often pushing it with my 1D MK IV at ISO 8,000 at f/2.8 just to get a shutter speed of 1/400 sec. If I want a higher speed I often have to shoot with my 85mm f/1.2 II which lets me get shots under the basket and the 3-point line if I do enough cropping.
And yeah that seems to be going too far it but a little noise reduction and I still get an ok photo.
From what I have seen with the 1DX I should be able to get a rather clean photo up to about ISO 25k. I'm also excited to try the camera with the new 600EX-RT.
Hey Mark if you are on a Mac using Photoshop try NeatImage.com. The best NR plug in... Works very well and 10 times faster than the others... I also have a 1D IV...