One of the most disorienting changes for newcomers to digital photography is shutter lag, the momentary delay between when you press the shutter and when an image is captured. With lag reduced to less than half a second for most contemporary digicams, I've found it easy to get used to. But there's no denying it makes digital photography feel different from film, and it may be a real killjoy for serious photographers looking for Cartier-Bresson's "decisive moment."
A U.K. photo site can help alleviate some of the pain with a chart listing shutter lag for dozens of popular digicams. The top end is dominated with Sony models clocking in at less than two-tenths of a second, while the underperformers include surprises such as Canon's high-end G7, poking along at more than half a second.
Digital Camera Shutter Lag Comparison Table[Cameras.co.uk]