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Pick up ansel adams book "The Camera" if you can read and understand it it will teach you all you need to know
in general iso and shutter speed are for exposure though aperture also has an effect but aperture is the only one of the three that effects depth of field
the other things effecting depth of field is the size of you sensor, the focal length of your lens and the distance to/from your subject.
Now imagine what it was like to shoot on film, where you took your picture then three days and 20 bucks later you got them back and could tell if they were what you wanted...
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Mike South
It's No wonder I took up drugs and alcohol, it's the only way I could dumb myself down enough to cope with the morons in this biz.
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