I think you're confusing progressive (as compared to interlaced) with rolling (as compared to global) shutter. The RED cameras are progressive, not interlaced and use a very fast rolling shutter.
yes I did intend to ask whether the exposure is "one line at a time" (rolling) or "all at once". I suppose that rolling is not a lot different than what happens with a focal plane shutter at shutter speeds far higher than the flash sync speed, as far as freezing motion goes.
Can you give me details, like
1. the total time between start of exposure at the top line of a frame to ending exposure at the bottom. Is this basically the stated maximum frame rate, or can it he significantly higher?
2. the minimum possible exposure time at an individual pixel between reset and read-out (or some related measure of the ability to minimize motion blur.)
I am more curious about the use of RED cameras in "freeze-frame" mode than in their moving picture capabilities, which I am sure are excellent.
Also, what can you tell us about
3. AF using RED lenses
4. AF using Canon and Nikon mount lenses.
5. aperture control from the camera body when using Canon and Nikon mount lenses, as T-1000 mentioned.