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05/03/2004 03:06:45 AM · #1 |
| I want to know how the iso rating of a film affects the picture quality.Why do we get grains when we use high speed films?Any links would be great. |
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05/03/2004 03:42:47 AM · #2 |
Don´t remeber any websides which explanes this in details.
But I know from experience and from what I have read that every instrument ment for some mesurements (light when talking about cameras) then more sensitivity means more faults.
If you go to the library or bookstore you could surely find some basic photography books which can explane this. |
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05/03/2004 03:56:28 AM · #3 |
| I don't know why the film grains exactly but in digital I know, it's because it is done by increasing the volume of the CCD and the pixels become more visible, since high ISO's are used in poor light conditions, where there is a good amount of detail loss, some pixels look weirder than others. I guess it's the same with film too, high ISO films being more sensitive to light, but I'm not sure exactly since there are no pixels. |
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05/03/2004 04:04:37 AM · #4 |
In fast (high ISO) film, larger grains of silver are formed, hence the grainy nature of the picture. In slow film, very fine grains are formed, hence the high definition.
In the digital world, ISO is the amount the light signal is amplified, similar to a "volume control" for soun; the more amplification (louder)applied, the more noise. Noise looks like grain! |
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05/03/2004 04:16:38 AM · #5 |
Originally posted by kghoshal:
Any links would be great. |
You need to check out Understanding Exposure at The Luminous Landscape. You will find what you're looking for there. |
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