So many people have posted their idea of safari equipment. I cannot resist to add mine:
Sony Alpha A33 with 500mm/F8 mirror teleSony Alpha A55 with Sony/Zeiss 135mm/F1.8
I found these 2 lenses ideal. Close targets were usually just at the right distance for the 135mm. Stopped down to F2.8 or F4, there are few lenses around that are sharper. Color and constrast is very good. At dusk, when there is less light I open the aperatur. At F1.8 with a body that has image stabilization I can still take pictures when others have packed up their gear for the evening.
Wtih the 500mm on a APS-C body I have a lot of reach. This is the only mirror tele with autofocus. Weight: Approx 760g. And it is also unobstrusive. Most 70-300mm zooms are longer. In sunshine I can set ISO 200 and still get < 1/1000 exposure time.
I am planing to get the A77.
In Tansania, go to Singita Faru Faru.