Hi all,

Here's a photo I took this morning: http://i48.photobucket.com/albums/f2...shbag/test.jpg

It's a blend of 2 bracketed RAW images, one for the sky and one for everything else. Details are:

Canon 300D
24-105L lens
ISO100
f/16
28mm
Sky: 2.5sec
Below horizon: 6sec

Now, you may notice that above the hills on the other side of the bay there appears to be a high bank of cloud. There was no cloud. This seems to be some kind of artefact, but I'm hoping someone can tell me what the hell is going on - I've noticed this in other images.

Is it a result of diffraction limit? Or is there something wrong with my aged 300D?