Originally posted by reh321 This seems like a discussion of "distinction without a difference".
At one time I photographed a fan to demonstrate "rolling shutter" on a 'Q'. The first photo shows use of the Electronic Shutter on my Q-7.
Then I photographed the same fan with my K-30.
The shutter speed I chose did not quite 'stop' the blades. but that is not the point. The K-30 photo shows a clearly recognizable fan, and there is no noticeable blurring resulting from my own movement.
Likewise, my photograph {with a long lens } of a bird was clearly recognizable as a "Baltimore Oriole", with no noticeable 'loss' because I hand-held the camera instead of running inside to grab a tripod {while the bird flew away}.
As you can see in the picture of the fan, the blades are distorted. This is the rolling shutter effect from the moving slit.
You appear to want some sort of debate about whether a focal plane shutter emulates a rolling shutter when the shutter speeds get above sync.
I don't quite understand why, when it is so plain that it does. Your picture proves it. The effect will be more pronounced the faster the shutter speed is and the faster the object being photographed is moving.
Camera manufacturers didn't give up on horizontal run shutters for fun, they gave up on them to get higher sync speeds to get away from the rolling shutter effect as well as to give flash photographers a better chance of balancing daylight.
At that, we have only seen at best a 2 stop increase in sync speed over a camera like the Nikon F3 (sync at 1/80) to the Nikon F5 (sync at 1/300)
Here in Pentax land, our latest and greatest camera gives a 1/200 second sync speed, or about 1-1/3 stop faster than the LX.