Hi I recently noticed that my Olympus E-420 when looking at my exposures after shooting, the pictures seem a lot noisier than I remember them to be. Even on ISO 100, when I zoom in, some colours and even the images of things that I wouldn't have though would be noisy, but quite crisp, appear noisy. Last night, I changed lenses whilst photographing my uncle's wedding, and I noticed that I accidentally left the camera on whilst doing so. I wondered if I had done this before, and maybe if this contributed to the noisy pictures. Does anyone know if changing lenses with the camera on is bad? Does it create more dust on the sensor? The camera has an automatic cleaner thingo, but i'm a bit worried now. Any help would be greatly appreciated.