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Yuvraj Jul 26, 2009 4:55 AM


is opting for auto iso better than lowest iso ?

I have canon sx10, I've noticed even in daylight pictures taken outdoors with auto iso turned out to be better than setting the iso on 80.

thank you.

JimC Jul 26, 2009 6:37 AM

The camera should be exposing the photos the same, regardless of ISO speed. It's just using faster shutter speeds as you increase ISO speed and/or using a smaller aperture (higher f/stop number). Most models like yours do better with wide open aperture settings (as the camera would more likely be using at lower ISO speeds), since diffraction can play a role with smaller sensors like you find in your type of camera.

You will probably have the highest image quality at your camera's lowest ISO speed setting (lower noise, better dynamic range), unless shutter speeds become slow enough so that you're getting blur from camera shake or subject movement.

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