Dennis wrote:
What physical changes occur in a digital camera to change light sensitivity with a change
in ISO. Does (can) it affect the final image. Any ideas………cheers Dennis
Digital cameras have only ONE ISO setting, (most of the time 50 or 100 ISO) higher setting are made with digital improvements (called electrical gain) depends in part also of the sensor size (2/3",1/8" or other) -bigger the size is -better the dynanic range is and less the noise appear. A 2/3" sensor with 3 Mpixels will create less noise with the same one with 5 Mp.
Of course most of the digital cameras are unusable at more than 800 ISO (for the best one)
because of this noise appearing particularly in the shadows of the image (can be partially erased with "noise" filter in PS)
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Houba houba.
Marsu.
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