ISO setting

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New Member
Jan 18, 2002
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I know there was some discussion here

Just to confirm my understanding... If exposure length is not an limitation on your camera, you shd use the lowest ISO setting possible.

Is there any reason why a person might choose/use higher ISO settings e.g. ISO400?

Yes, its advisable to shoot at a lower ISO if possible.

So... why use a higher ISO?
This is something I typed in another thread:
In addition to all those said... ISO 200 will require half the amount of light to achieve the same exposure compared to ISO 100... and ISO 400 will require half the amount of light to achieve the same exposure as compared to ISO 200.

So, when do you reach for that ISO button? Generally, use ISO100, this gives better image quality, less noise (Random nonsense pixels). Let's say you are indoors or the sun is setting... you pull out your camera, measure the exposure, and Oh god.... You need 1/10 seconds to achieve the correct exposure even though your aperture is set to the widest... and you don't want the flash to throw out the ambient light or for some other reason. And you didn't bother to bring that clumsy tripod or there's no space/time to set it up. So, reach for the ISO switch, switch it to ISO 200 and the shutter speed magically becomes 1/20 seconds, which may not be the best to hand hold but better than 1/10... But darn... due to the lack of breakfast... you are shaking like a drench cat... pump the ISO to 400 and you only need 1/40 seconds~ Nice~ Snap away~

With a higher ISO, you may not get the best picture, but you don't lose the picture(s)!

In addition to that... Sometimes you like to freeze the actions and do not want to us flash... say in some sports game... You may like to shoot at a higher ISO so that you can achieve a shorter shutter speed.

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