I took the pics down when it became clear what the problem was. Sticky aperture on the lens. It'll be off to the repair wizard soon.
Shel > [Original Message] > From: Godfrey DiGiorgi > I haven't been able to see the photos for some reason, but it sounds > like the second one shows significantly greater exposure even though > the camera was on Manual exposure and the settings hadn't changed. > > I have seen this occasionally myself (one proper than one overexposed > exposure at the same settings) but almost always/only with the older > A and K/M lenses, so I'm inclined to believe john might be right. > Curiously, I more often see a tendency for the DS tends to > underexpose a bit with the A lenses compared to the F/FA series lenses.