Is anyone having the following problem “rolling shutter distortion” with Canon R5, Sony a7r4 or other cameras using anything other than the mechanical shutter?
January 25, 2021 · Technology,Fascinating
“Contrary to what most people believe, your camera, and most cameras out there are not able to capture ONE SINGLE moment in time. In fact, your camera probably actually captures multiple moments in time and splices them all together to give you one solid image. Most of the time, you’re none the wiser. But occasionally, you might notice that something isn’t quite right about your picture.
As previously mentioned, the sensor is not exposed entirely at the same moment in time, but rather has a ‘rolling’ quality to the exposure. It is as if a slit is moving either horizontally or vertically across the whole entire image. This occurs at a rate of the maximum frame rate of the particular sensor. For example, if the sensor operates at 30hz or 30fps, rolling shutter occurs over 1/30 of a second. If the sensor operates at only 10fps then rolling shutter occurs over about 1/10th of a second (0.1 seconds). In either case, that means tens of images are captured at slightly different moments in time.
While the process is still quite quick, and in most cases, the object of the sensors is not moving quickly enough to have any effect, occasionally, this process of image capturing can significantly affect the outcome of the photography.
Similarly, if the subject of the camera or the camera itself is moving from left to right or vice versa, it can cause the image to bend diagonally in one direction. Imagine trying to take a photo of Usain Bolt, the fastest man alive as he runs by you from right to left. You’ll come away with an image in which you capture his head on the right side, his body in the middle of the image, and his legs and feet towards the left side of the frame. In essence, it will appear as if Bolt is leaning backwards to the right even though he is actually tilted slightly forward (left).”