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ISO is the measurement of the camera's sensor/film sensitivity to light. It is one of the 3 ways to create a well exposed image (The other two being Aperture and Shutter Speed). Typically, a higher ISO for a correctly exposed image will result in the image being more noisy/grainy.

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in a very well lit room. I zoomed in to just focus on the screen while in full AUTO / Green mode. ISO was showing 7200 and the exposure light wouldn't stop flashing, so I couldn't take the photo … able to take pictures of other things in the room. I eventually just flipped to CA and took the shot. Is this normal behavior - Why did the camera choose an ISO that wouldn't allow for the shot to be taken, rather than using the flash? And auto-focus squares were clearly lighting up. …
asked Feb 12 '13 by Seth