I Know I run into this difficulty quite often when taking hang gliding pics. The last time, I used a grey card to get my exposure. The colors popped, the sky was great,BUT, the pilots were too dark and I felt that it really took away from the photo itself. I've been thinking about purchasing some graduated colored filters, or maybe some graduated neutral density filters to help in these situations. but of course money is always an object!Ive priced these filters they are not cheap. Also I did want to say otherwise cool photo!