The shutter is a slit that travels across the sensor. The slit exposes the pixels that are being exposed for 1/16,000 of a second but there are a lot of rows (or columns I am no sure what direction the slit is oriented) so the travel of the slit across the whole sensor even when it exposes each row/column for a short time takes 1/10th of a second. If the subject moves during that 1/10th of a second it can cause distortion in the image because the what was exposed as the slit travels across the sensor will not line up.
anselwannab wrote:
I still don't get it.
First off there isn't a shutter running across? The mechnical shutter is out of the way. It's sensor based 'shutter', but how can it take 1/10 of a second for a 1/16000 exposure? That's an oxymoron. Seems a bit useless, because I assume that if you move the camera during this time, you can blur, or at least get artifacts. Need less light, use a ND?
I see some people are getting theirs soon. Is there an idea on what the longer supply situation will be? IT's 2022, you never know/
There are two exposures happening with electronic shutter. When set to 1/16000, that is the duration for which the pixels capture light. But when you press the shutter release, they don't all turn on and off at the same time (that would be case with a global shutter sensor - probably still some years down the road). Instead, the sensor 'scans' across the rows of pixels, turning them on and off and reading out the info to the processor. The speed at which this 'sweeps' across the sensor from one end to the other, takes 1/10 second. So, each pixel at 1/16000 'freezes' the action, but because it takes so long from one end to the other, if the subject moves, it will result in distortion. Not necessarily blur because of the exposure time of the pixels.
As Michael alluded to, there are times when even a slow 'scanning' sensor can still be OK with some subject movement, because the full scan time, is for the full image. If the subject fills the frame and is moving, then distortion will be more noticeable because it takes the M11 1/10 for the full image. If the moving part of the subject fills a fraction of the frame - Michael used the example of 1/8 of the image, then the 'scan speed' across that moving portion of the subject will be 1/80, which is better. It will depend a lot on these factors how much you'll notice rolling shutter effects.
Jan 15, 2022 at 01:30 AM
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