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PostPosted: Mon Dec 12, 2011 10:54 pm 
in several of the low-end point & shoot cams, there are choices under the "P" mode, e.g. ISO setting. as i read that the low end cameras distort the image when the ISO is set too high, am not understanding how change of ISO "sensitivity" affects the camera sensor operation.


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PostPosted: Tue Dec 13, 2011 1:39 am 
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As ISO goes up - so does the noise. The reason for increasing ISO is to reduce the shutter speed, but it does come as a cost of the aforementioned noise.

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PostPosted: Tue Dec 13, 2011 6:32 am 
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When you increase the ISO you increase the signal output from the sensor, and that includes the noise from the electric charge running through it.
Here's an analogy: For a P&S with its tiny sensor it's like trying to push massive sound (lots of megapixels) through a tiny speaker (small sensor). The result will not be very clean. The smaller the speaker the more pronounced to undesired noise will be

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