Ok this is probably a really dumb question but, why do all my photos of countyside scenery end up with White sky's. It can be a superb day with only a few clouds about but the Blue ends up White 
I have a EOS 450 with the standars 18-55 lense, I've tried on full auto, landscape, AV under ecposed, AV over exposed, Raw, jog.... you name it I've tried it.. I think
Ant advice would be most welcome


.
