I use (learning to) a Canon 7d and have the following lenses: Canon ef s 55-250mm 4:5.6 Canon ef 50mm Macro 2.5 Canon ef s 18-55mm 3.5:5.6 Canon ef 28-105mm 3.5:4.5 Canon ef 50mm 1.8 Sigma APO DG 70-300mm 4:5.6 I want to produce Photos that are as clear and sharp as those taken by chieftiff here http://www.arrse.co.uk/photography/159400-my-new-canon-70-200mm-f2-8-l-series-lens.html At the moment I cannot come anywhere near to the sharpness of chieftiff's Photos. Am I being deluded in thinking I can with any of the lenses I have. I'm taking, in my opinion at least , OK Photo's and the odd 1 or 2 look sharpish. I know that the L series are better.......so really I have to buy L series don't I. End of waffle.