I've got a Canon 80D camera, and keep seeing a round smudge in all my images. At first I thought it was something on the lens so I wiped it carefully, but that didn't work. I tried a different lens but the smudge was still there which led me to believe it's a camera issue. I've attached two photos taken with 18-55mm and prime lenses. Any ideas what it is and how to get rid of it?
