Thanks for the comments - I agree really. The main beneficiary of 'High Dynamic' processing in these images certainly seems to be the sky. As has been mentioned the downside is the ISO 400 - which no doubt would be evident with further cropping/big prints, and the 'unnatural look' - shadows being lightened, and greens changing. To me the abbey shot looks 'flatter' than the river image, so perhaps in some instances it's worth a shot. I always take jpg + raw, so OOI, will have a play with the latter and HDR prog to see what I can come up with; it's no doubt possible to come up with something that yields a more interesting sky, but with understated foreground/shadow changes.
Andy
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UK
http://flickr.com/photos/25983110@N05/