 The default sensitivity on the D40 is ISO 200, and the D40 adds an ISO 3200 speed (listed as "Hi1" in the camera menu) compared to the Nikon D50's maximum ISO 1600.The D40 has a very fast 1/500 flash sync, useful for daytime fill-flash.This compares to the typical 1/200 sync speed of other entry level and even some semi-pro DSLR cameras such as the Canon EOS 40D with its 1/250 sync speed.