Originally posted by hnikesch Now this explanation makes more sense to me, as I was able to stop motion of a baseball traveling @ 90 MPH with my shutterless adapter @ 1/3200 sec. Now the 1/13 sec.or more flash sync time must be the shortest duration that has all the rows of sensors capturing light at the same time.
Hans
Ok i get it, so each pixel is only reading for 1/3200s each, but it takes 1/13s to make a sweep of all 12million of them.
Lets assume that it starts scanning in rows from the top left across the pixels in the row and then down to the next row left to right scanning across each row and down to the next row until it gets to the bottom right corner 1/13 s seconds after it started the first pixel.
Fast moving objects would get distorted if parts of them were scanned with some delay.
The ball going at 90mph is moving fast but since it is small (number of pixel rows) is few and the delay in scanning the top part of the ball and the lower section of the ball is negligible so no distortion.
In this shot the Batter probably didn't attempt swing his bat as the Pitcher sent the ball down near his ankles
but I wonder if the the batter did swing his long bat then would it look "curved" or distorted due to the scan time if it was vertical?
The same sort of thing happens with mechanical shutter DSLR's but the shutter takes a bit less than 1/180s to cross the entire frame.
The shutter curtains move downwards exposing only a narrow slit for faster shutter speeds but they still take 1/180s to travel from the top to the bottom.
Next time you're in a propeller engined aircraft take a picture of the rotating propeller blades at maybe 1/4000 or 1/6000 or 1/8000s and you can "freeze" them but they look curved.
when in reality they're straight.
Same rolling shutter effect but since the DSLR mechanical shutter is 180 /13 = 14times faster than the Q electronics scan so the effect is less.
The scan speed of live-veiw is much slower so if you look at the propeller blades through liveview LCD they look like they're detatched like crew1's fan shots above.
.
so which one?.....
.
I think I'd probably go for the $250 Pentax one with the shutter....... but only tell the wife i'm looking at the $40 ebay ones.