20th April 2003, 04:36 PM
20th April 2003, 04:38 PM
ISO ratings refer to the light sensitivity of the medium(whether film or digital).
It then determines the shutter speeds you can use for a correct exposure with any given aperture.
Grain or noise is just an unfortunate tradeoff.
20th April 2003, 05:24 PM
ISO stands for International Standards Organisation.
Use lower ISO for low light or still photography.
Use higher ISO to capture fast moving objects. However, noise will result if there is insufficient light. Hence use of flash is recommended when using a high ISO.