Why buy a Sony 20-70 mm F4 lens?
Redefines the standard zoom category with a range of focal distances that extends from ultra wide angle from 20 mm to ...
EF 70-200mm f/2.8L IS II USM Lens for Canon Digital SLR Cameras $850
Canon Extender EF 2X III $300
Canon MP-E 65mm f/2.8 1-5X Macro Lens for Canon SLR ...