I have several questions about the type of equipment I would need for future development and expansion of activity for product photography. I have a Canon 20D with a 17-85mm f/ 4-5.6 USM IS My general question is what type of lens is suitable for product photography? What specification should it have? For studio shooting (not large format camera). My idea of product photography is relatively small items, such as wall clock, watches, food etc. I need to know, for instance, what lens would suit light tents, should it be a wide lens, macro or..? what kind and... If anyone could also advise on the lighting set power interms of w/s or joule, I would appreciate that.