The interesting thing with iso 80 on the K5 was that it did provide more dynamic range than the iso 100 setting. Apparently base iso on the K5 was measure at something in the upper 70s by DXO Mark, allowing for a bit lower iso to be allowed. On the other hand, the kx had a base iso of 200 and allowed 100 to be shot but didn't give any more dynamic range.
I guess what I don't understand is what happens with cameras where the base iso is 100 and they allow you to go down to 50. The whole point of extended range is (I think) to allow for longer exposures in strong light, but I guess I don't understand why it doesn't produce way over exposed images.
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