There is no big picture...only these poor puzzle pieces.

Canon Rebel XTi

Canon 7D

Canon EF-S 18-55m f/3.5-5.6

Canon EF-S 17-55mm f/2.8 IS USM

Canon EF 100mm f/2.8 L IS USM

Canon EF 70-300mm f/4-5.6 IS USM

Canon EF 28-135mm f/3.5-5.6 IS USM