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ISO Speed and Image Noise

The following pictures show the relationship between high ISO values and low picture quality. Also the differences between cameras can be seen.

All pictures are 100% crops. Pictures taken in RAW are shown both before and after USM sharpening (Photoshop UnSharpMask filter with options 100%/1px/0).

	5D RAW	300D RAW	IXUS500 JPEG	5D RAW + USM	300D RAW + USM
ISO 50		-			-
ISO 100
ISO 200
ISO 400
ISO 800			-
ISO 1600			-
ISO 3200		-	-		-