As a photographer you might tend to pack big. This tripod and that monopod and that lens and this filter. Let yourself put all together and then look at it. How high is the mountain? Now leave it there for a couple of days and then go through it again with the question for every item, for what would I use it and how often would I be able to use it on photo safari? Some items will go out immediately others are doubt cases. Talk to people with experiences in safaris, reflect on how you use the equipment you have and how often you use the items now and how you could use it on safari. When you need to think about how you could use an equipment part on safari, it usually means that you won’t need it, otherwise the thought would not have come.
Now the mountain should only be a hill. Next step is to try and get it into your backpack. If it fits immediately, you are set. If it does not, another decision round might be necessary.
By doing that carefully and with time, you will have a relaxed African photographic safari with exactly what you need and no unnecessary kilos to carry around.