New to this site (looks great) and new to DSLR camera. Have had point and shoot since dec 08 and just bought canon 40D with Canon EF 35-150mm f/4-5.6 lens. Would love feedback re further lens purchase to cover macro, sports, landscape, walk a bout etc. Also any advise on best backpack to house up to 3 lenses and usual accessories. I saw one that had a side loading tripod holder but didnt save it on my pc. Would appreciatre any feedback from members. thankyou very much. Bill.