Rolling shutter sensors, why do they still exist?
From iphones to dslrs, they all use cmos sensors that use rolling shutters to capture images, are there any dslrs that use digital global shutters, it seems to me that the firms which addopted cmos have taken a step beckwards from the days of CCD sensors. Its been years now since cmos was introduced and it still hasn't evolved a global shutter why? Rolling shuter artifacts can be a real headache and spoil images/videos.
As you may or may note know, the "rolling" shutter is much more evident when using a single CMOS sensor. This because of the way the sensor captures the image, top to bottom scan.
CCDs use what is referred to as global shutters which take a snapshot representing a single point of time, so no "rolling" effect is noticed. This means that true video cameras using 3-CCD sensors are not affected by this problem.
The "Step back" has to do with economics. A CMOS sensor is much less expensive to produce in large sizes than CCD's. Even then, the cost of a full frame CMOS is nearly ten times that of a cropped frame CMOS sensor
You may have noticed that professional production companies that use video, shoot using 4K video cameras and they do not suffer the same issues that single CMOS dSLR still cameras with a video feature have.
Still images are not spoiled by using a CMOS sensor, since they use the cameras shutter to control that amount of time the sensor is exposed to focused light
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