Examples - D200 with ISO Auto and Flash
Prepared 2006-11-19 (149/71463) by Bill Claff

The attached mosaic has three columns with five rows.
All taken with D200 50mm f/1.8D 1/250s ISO 100 SB-800 with ISO Auto On
Just resized with no other post processing.
The ISO values were:

	f/1.8	f/11	f/22
Spot iTTL	100	100	110
Matrix iTTL	100	100	110
Matrix iTTL-BL	100	100	160
Center iTTL	100	100	125
Center iTTL-BL	100	100	160

Note that ISO does start to increase once there is not sufficient light.
However, even when it kicked in those shots are about 1 stop underexposed.