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#1 |
Junior Member
Join Date: Sep 2003
Posts: 10
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Could anyone explain why digital cameras try to emulate 35mm film cameras where exposure is concern, eg, ISO 50,100,200, etc.
Each pixel of the light sensor, CCD or CMOS, should be able to register 'color' & light intensity (exposure). The advent of the Fovean chip enables each local pixel to capture color information even more "accurately" without the need for interpolation. Why should the problem of over and underexposure still exits with digital cameras? |
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#2 |
Senior Member
Join Date: Aug 2002
Posts: 1,910
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Why emulate film cameras, because people are used to the way they operate. The same reason why computers use QWERTY keyboards rather than the superior Dvorak layout which makes it much faster to type (QWERTY was originally invented to slow down typists to prevent keys from getting stuck).
ISO on digital cameras turn up and down the gain of the amount of light that is registered on each photosite...but with turning up gain you also turn up noise. Even happens on video cameras with a "gain up" button. It's the nature of the beast. |
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#3 | |
Senior Member
Join Date: Dec 2002
Posts: 5,803
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I think you asked two questions, but didn't know it.
The answer to this one Mike didn't give: Quote:
Your pupil does the same thing for the human eye, enlarging or shrinking to control the amount of light that gets through and hits the back of your eye. As to the question of ISO.... well, they could have changed, but how? The effect it has is useful (making the camera more sensitive to light, in trade for more noise/grain in the picture), so are you suggesting that they rename it? Eric |
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#4 |
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Join Date: Aug 2002
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But even at a certain light level the eye will lose colour information as the colour "sensors" in your eye require more light than those that just sense light. If you are in that situation, you will see in B&W, and what you see will look grainy.
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#5 |
Junior Member
Join Date: Sep 2003
Posts: 10
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Thanks Mike & Eric for the replies.
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