"I believe Don should purchase the SONY AF 70-400mm f/4-5.6 G SSM lens to replace his Tokina AT-X 840 80-400mm f/4.5-5.6 and TAMRON SP AF 200-500mm f/5-6.3 Di LD lens for the follow reason: so he can mail the two crappy lenses to cdifoto so that cdifoto can eBay them and hopefully get enough return to treat himself to McDonald's."