I have tried with a few HD cameras like Sony PMW-320, Sony Fx100... My problem is that when I set the field to progressive (tried them all... 24p, 25p, 50p, 60p, 1080p etc...), the video in the viewfinder is VERY choppy even with the slightest moves. It's more like a "stutter" then choppiness. Did you ever accidentally export PAL footage to NTSC or the opposite in a NLE program? Exporting or encoding the wrong frame rate will cause a very similar choppiness that I experience when shooting progressive on cameras that shoot full HD. Because of this problem, I have not yet shot in progressive mode but I need to know what is causing this and what the solution is. Thanks.