When should I service my cameras and lenses?


How much for service cost?


Do I need to service camera with lens together?


Using cameras: Canon 1D MK III (around 10K shots 4 months old) and 5D MK II (around 15K shots 5 months old)


Using lenses: Canon EF 16-35mm f2.8, 24-70mm f2.8, 50mm f1.2, 70-200mm f2.8 IS, 100mm Macro f2.8 IS, 300mm f2.8 IS and Ext 1.4x II


Flash: 580EX II


Suggestions? Thanks !