Seriously, this entire thread is complete nonsense. Sobolik, I suppose you only shoot with a kit lens then right? Its the only lens you need after all and is of equal quality of all other lenses.What a joke. I think you just like dipping your swizzle stick in and stirring the pot. Do you absolutely NEED a kit lens for a wedding? Under most circumstances, no. However, for certain effects ( Formal shots with DOF effects, low light shots with movement ) you absolutely do, but its not a MUST have. So in a sense, I agree that fast glass is sometimes pushed excessively. I would rather shoot a wedding with my 17-40L f/4 and 580EX, than with a 50mm 1.8 MarkII budget prime and no flash. But to say the kit lens is as good as most faster pieces of glass, is complete BS. And every higher end lens is going to have better IQ than that kit lens. Sure there are crap budget lenses that are worse, but people argue primes because they are the cheapest next step up in IQ as well as speed in most cases. Also, as everyone has failed to mention, a fast lens also allows your camera to focus better given that tha aperture is wider so the camera sees better. The aperture only closes to the chosen f/stop when the picture is taken. Sure using a flash (assuming it is capable ) can help AF if it has an assist but we don't know that.