Dynamic Contrast:
With this turned on this monitor is rated at a contrast ratio of 3000:1. With it off it's rated at 1000:1. This 'feature' simply turns the monitors brightness all the way up to 100% when turned on, it does nothing to the actual contrast. It's a cheap marketing thing to claim 3000:1. Also when DC is turned on you cannot change the brightness anymore. A pointless feature. Even though my Dell 2405's are also rated at 1000:1 the contrast on the 3008 is considerably better, this monitor has great contrast so dont be disappointed by Dynamic Contrast being a joke.
i've had a test about with the dynamic contrast feature, and it doesn't appear to be exactly as you say.
if i set the brightness on my screen to 100% and show a black screen. when i turn dynamic contrast on, the brightness gets knocked down a little bit.
similarly, if i show an all white screen and turn dynamic contrast on, the screen does NOT appear to dim in brightness.
so it would appear that dynamic contrast does work - however it's simply just an automatic change of brightness levels depending on the overall brightness of the picture. (lower brightness in darker scenes.)
also Mr.B - i dunno why but i seem to like having the brightness level set to 100% , it makes whites on the monitor look even whiter, and maybe it's my eyes playing tricks on me; but i seem to find it easier to read text etc. when the brightness is set to 100%, instead of the default 75%.