Can anyone point to where can I understand more about sensor sizes and the quality of image? I know that Panasonic cameras has 1/1.7" sensor, but the camera suffers from picture noise..whereas other cameras (Olympus, Canon, etc) has 1/2.5", yet the image quality is some much better (i.e. less noise). This may be due to processing of the image as it converts picture into Jpeg form. I refer to the non-DSLR cameras. Why is this so?