Please kill me! Oh, wait, I'll kill myself!

I've own my D7000 for 10 months now. Yesterday I dusted off my Manfrotto tripod for some night shots, set ISO to 100 and my shutter was just too quick ...
I'd always had my ISO to automatic ...

post some pictures so we can see subjects and shooting data. that will help.

Actually, I deleted all those that came off at ISO 3600 ...and that was only because I had set an ISO limit, otherwise, the camera would have chosen 6400

Here is one with the following data. There was a game at a stadium over the hill.
Device: Nikon D7000
Lens: 35mm f/1.8G
Focal Length: 35mm
Focus Mode: Manual
Aperture: f/11
Shutter Speed: 13s
Metering: Matrix
ISO Sensitivity: ISO 200
Long Exposure NR: OFF
Active D-Lighting: Auto
Sharpening: 3
Saturation: +2

It was 13 seconds at F11
changing to F16 you would double your time to 26 sec
changing to ISO 100 you would double your time to 26 sec
Changing to ISO 100 and F16 you would go to 52 sec.

Been a long time since I taught people this concept so someone check my math and concept thinking.

If you have a IPhone there is a app that will help explain the relationship of the three
http://itunes.apple.com/app/slr-camera-simulator/id443396787?mt=8

Thanks. I actually tried it with ISO100 also. The issue is that I had the camera set at automatic ISO, so it wasn't taking my settings, all this time I've been shooting in auto ISO and didn't even know it


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