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Old Feb 4, 2004, 3:10 PM   #1
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Default ISO's? help plz ;D ;D ;D

does anyone care to explain wat iso is good for wat situation? any help will be greatly appreciated! I remembered i can change that on my G2 so i wanna make sure i'm using the right one (when i venture over to the manuel mode )

my camera does these ISO's:
ISO 50
ISO 100
ISO 200
ISO 400

there are more i presume...(i think it goes to 1000?)
but i think i had my sunsets with the geese set on 50.....is that wrong?
the faster film lets in less light? right?
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Old Feb 4, 2004, 3:48 PM   #2
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The lower the ISO number, the less noise in the image. The tradeoff is you have to use a slower shutter speed for the same exposure.

If you are shooting in low light or are trying to freeze motion, use higher settings. On my D100 the lowest setting is 200 and I use that for everything. There is an auto setting but by manually setting to 200, my aperture and shutter speed are more meaningful to me.

My Minolta S414 has only a few ISO settings ranging from 50 to 400. I leave it in auto since it only has two aperture settings and only a few shutter speed settings. Going auto for everything gives the metering system more latitude.

It should be noted that I have shot 35mm most of my life and you can't change ISO settings in mid-roll without changing film.
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Old Feb 4, 2004, 4:30 PM   #3
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My general rule is the lowest ISO that I can get away with. This means look at the shutter speed for the aperture you want. If the shutter speed is too low, turn up the ISO (or use a flash.)

Eric
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Old Feb 4, 2004, 4:31 PM   #4
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It is a tradeoff when dealing with ISO and shutter speed as calr has pointed out. I set my 5700 three user modes for varing ISO requirements.
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Old Feb 4, 2004, 5:04 PM   #5
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ok so in my fan picture (see other photos thread intitled"wierd subject")
i could've use a ISO or two higher to make it brighter without using flash?(i wanted it to blur a bit)i ended up using a small lamp with a 60 watt bulb....
thanks for your help
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Old Feb 4, 2004, 9:00 PM   #6
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If you don't feel the picture will be hurt by more noise/grain, then that is the right thing to do (i.e. you are trading noise for more light... some times you want the light level that is there.)

Eric
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Old Feb 5, 2004, 7:07 AM   #7
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You can get away with higher ISOs depending on the the CCD. I've never been able to use anything above ISO 200 on my CP4500, but I use ISO 200, 400 and even 640 on my D100.

From test shots you do see increasing noise on the D100 with ISO increase, but for normal daylight subjects I can't spot the difference. For example -







Regards,
Graham.
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Old Feb 5, 2004, 8:39 AM   #8
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thanks for all your help! i think i got it now! correct me if i'm wrong
the higher the ISO number the more noise you'll get but you can work in less light.
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Old Feb 6, 2004, 4:44 AM   #9
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Spot on. How much noise depends on the camera CCD and whether you can live with it is up to you.
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