It's Getting Really Dark, and Sunset's Still Two Hours Away

PLEASE NOTE: Expsosure compensation was set at -2. I have no idea why the "Exposure Bias Value" in the EXIF data immediately below is listed as +-20/6.--LKExposure Date: 2010:05:28 17:25:43;
Make: Canon;
Model: Canon EOS 5D Mark II;
Exposure Time: 1/4000.0 seconds s;
FNumber: f/4.0;
ISOSpeedRatings: ISO 800;
ExposureProgram: Other;
ExposureBiasValue: +-20/6
MeteringMode: Other;
Flash: Flash did not fire, compulsory flash mode;
FocalLength: 100.0 mm mm;
Software: Adobe Photoshop CS2 Windows;