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PLEASE HELP!!! IM A DSLR VIRGIN!!! Any chance the Sigma 18 - 200 and 18 - 250 and 10 - 20 f3.5 may be reviewed..? Im especially interested in a functionable lens for the 7D for use with video.. For a 1.6 crop camera, with video function, the following is important: A large zoom, either one lens or two...