So what i have is a Cannon EF-S-55mm camera lens. its brand new, in the box with all paperwork and warranty. it has never been used because the lens was upgraded upon purchase and this lens came with the camera body.
it only matters below shutterspeed 1/40 but not below .5 seconds. unless you are in deep telephoto the is helps. IS on a 18-55 mm though wont do too much. if you are shooting low light you should have a tripod anyway. you can take pics on a sunny day at 100 film and most aperatures pretty much until the sun sets and not go below 1/40. its just one of those things to try to get you to pay more money for your camera.....just like adding a few megapixels, when a 8 megapixel camera can make a poster no problem, you really dont need anything bigger than a poster......most of us just compress the image down and put it on facebook or NS . com anyway.