Morning Calm

At least I thought that was what I was photographing. Turned out it was a horrendous indication of just how dirty my camera's sensor is! A cleaning session is obviously long overdue! (I tidied up the sky before posting - I have posted a close up of a corner of the original as an extra so you can see what I mean. I know it is a product of a clear sky and a small aperture, making it more noticeable, but probably still worth doing something about it.)