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3 comments:
1157: All digital SLR cameras (ones that you can swap lenses on) have mechanical shutters just like film cameras.
As far as I know, almost all non-SLR digital cameras (with fixed lenses) don't have a mechanical shutter, they just turn the power on then off for the imaging chip, but you can still adjust the length of time the chip is powered on...effectively controlling the shutter speed.
The benefit of a mechanical shutter is that it absolutely blocks light entry to the imaging chip in a precise and controlled manner. Cameras with out mechanical shutters do not stop "recording" all levels of light equally...so a really bright source of light is recorded for a longer duration than weaker light sources. You can end up with light smears like this:
Example
The drawback to mechanical shutters is that they wear and fail after so many cycles. (usually hundreds of thousands)
Darryl may look like a tall, skinny geek... but he is really a STUD! Right Lori?
I guess it's just a comfort thing...it's got to give some sort of feedback when you push the button, and the sound of a camera's shutter is way more unique than just a beep.
You usually can turn it off or change it to another sound though.
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