Kenya is among the best locations for wildlife photography in the world. There are many national parks with plenty of mammals and birds that do not exist in the wild outside of Africa. In particular, the Masaai Mara National Reserve in southern Kenya, along the border with Tanzania, is generally regarded to be the best of the best.
If your objective is to shoot high-quality wildlife photographs, in my opinion you need to bring some long lenses and join a photography-specific tour that go out early in the morning and stay till early evening (with a long break at noon when the light is harsh). Moreover, since one will be photographing from safari vehicles most of the time, it is important to have no more than 3 or 4 photographers in each vehicle; otherwise, they will be interfering with one another. 
The success of a photo safari has a lot to do with the group of people one is traveling with. To shoot excellent sunrise shots, it is necessary to get up early every morning and be ready to leave at 5:45am. To take full advantage of the best light, one might have a packed breakfast in the field rather than returning to the lodge at 9am for breakfast. And one needs to wait patiently late in the afternoon, when the animals become more active, rather than quitting early to have a drink at the bar. If the main objective for your trip is to photograph wildlife, it is very important to be traveling with a group of people with the same objective.
Equipment and Film:-Since there is wildlife such as lions, cheetahs ... around, it is illegal and dangerous to walk around in most game parks. Therefore, most of the photographs are taken from inside safari vehicles. As long as one can carry his/her equipment onto airplanes and vehicles, the weight of all the equipment isn't that much of a concern.