Interesting stuff, thank you Gary and all (mostly
).
Had a bit of a play this arv, but didnt come up with anything dramatic. May take a bit to find out how to achieve those dramatic results.
Took me 2 hours today to find out how to get 100 ISO on my 450D, and fianlly worked out how to turn off ' highlight tone priority', then you can get 100 ISO. It seems its better to shoot at ISO 100 for HDR.