Loking at the reviews, "ISO equivalence on a digital camera is the ability to increase the sensitivity of the sensor to enable faster shutter speeds and/or better performance in low light. The way this works in a digital camera is by "turning up the volume" on the CCD's signal amplifiers, nothing is without its price however and doing so also amplifies any noise that may be present and often affects colour saturation." I am not sure where the point of no return is, but I would like to stay under it looks like as long as I stay at or below 400, it's not to bad. So knowing this, do I realy need a fast lens?

You can't call it work if you love it... Zen Tambour