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I never realy understood why there is an ISO setting on a digital camera, its not like you can replace the CCD with a different type to make it more or less sensitive to light. I can only think that it artificially introduces noise to the image to make it look like a film camera. Bit of marketing hype maybe. Could also be Im old and grumpy looking at all my old film SLRs that don't get used any more....
The Android camera documentation tells me you can control the aperture (if the device you are using has one), shutter speed and ISO when an app takes a picture. If you wanted to be able to control these things you'd need to write an app which uses those parameters and makes a camera request to take a picture.To use potentiometers you'd need a hardware device that can read those potentiometers - something like the Android Dev Kit:which would communicate those values to the app running on the phone which would then use them to make the camera request.
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