I used to shoot weddings, albeit on medium format (Bronica SQA), there is no way I would use that lens for a wedding. I never shot less than f4 and generally at f5.6 as the proximity to the couple blurred the background anyway. Point I am making is, use a shorter focal length zoom for the weddings - believe it or not, the 18-70mm budget yields very sharp results, likewise, the 55-200mm VR does also. Each of these zooms has a 3-4x ratio, lens manufacturers have got these off to a tee, the 11x ratio of the 18-200 is far too much a jack of all trades.