Why do digital SLR cameras use mechanical shutters?
Mechanical shutters can wear out or break. They also limit shutter speeds when using a flash because of flash synchronization problems. Why not control exposure time electronically by turning the image sensor on and off?
Answer:
because it would probably add $1000 to the price tag. Some fundamental principles of designing prducts is:
1. If it is proven in the field dont change it untill you need to
2. If it solves 80% of the problem you probably do not need to change it.
3. New designs cost a lot of $$$$$$$$$ to prove so stich with #1
4. Identify your target customes' needs. (mstly means stick with #2)
It usually is not a technical problem... It is mostly about money. Are you actually talking about a mechanical shutter? or are you talking about snapping the mirror out of the way? If you are really talking about the mirror - it has to go, or you can't have a "single-lens reflex" camera. Or, if you insist on a similar capability, you have to split the light between the focal plane sensor and the viewfinder - which decreases the light to the sensor -- a poor design. Why change something that works? From what i have seen in the camera field no Electronic shutter has yet to beat a mechanical shutter. My D200 shoots 5 frames a second and has a large buffer to keep shooting. Electronic shutters tend to lag and only have short burst modes. As far as wearing out or breaking I dont see how you can say that. I have a Rolliflex Twin Lens camera from 1939 that still works, I also have several 35mm bodies that still work that are about 20yrs old. Oddly, I have gone through 4 digital cameras that were all electronic. For flash sync, buy a real camera and elimnate that problem :) Backward compatibility with lenses from film SLR, for the most part. Cameras are cheap. Lenses are expensive. Easy. Most digital SLRs are not designed from the ground up for the job, instead they started their lives as a film design. It was less expensive to take a working system, like the Nikon or Canon, and figure out what it would take to make it digital.
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Why do digital SLR cameras use mechanical shutters..
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