Safari Decision... leave the Oly 40-150 Pro behind?

I haven't read every single post so I don't know if this has been mentioned yet! Like I said from my own experience of the Masai Mara, the 100-400 in theory will cover around 80 - 95% of your encounters however this will vary. For example from my own experience of going twice to Kruger, I was using the 35-100mm 2.8 a lot more when it was green compared to later when I went during the dry season. I noticed I hardly used the 35-100mm 2.8 during the dry season until I got hit by the first of two cold fronts which turned the area from a British heat wave to a cloudy British winter day. My previous trip I was doing more environment shots with the 35-100mm 2.8 and taking advantage of animals in their lush green environments. You couldn't really do that when there's a lot of dead looking bushes everywhere during the dry season. Anyway you can afford to leave the 40-150mm 2.8 at home but you will miss shots in low light and close encounters.

I don't know if this had been mentioned but how many camps are you going to and have you researched them? With my holidays I often google them, watch videos, visit trip advisor and go on Flickr.

For the camps you'll need a walk around lens and each camp has their own 'guests.' You might find the 40-150mm 2.8 to be useful here with it 2.8 aperture but you need to ask yourself how close are you willing to get.

My last trip I went to five different camps. Each camp usually have birds you can get somewhat close to.

Camp 1

• Baboons

Camp 2

• Velvet monkeys
• Warthogs
• Fruit bats

Camp 3

• Velvet monkeys
• Wild cat - Our group was getting ready to have our food outside when the cat walked right by me. It's funny because some of us spent about 30 minutes earlier looking for her only to have her walked right by me later. Sadly I didn't have the camera on me which was set up with the flash.

Camp 4

• Antelopes 
• Genet
• Fruit bats
• A frog with excellent climbing abilities
• The hare that like to camp outside my room

Camp 5

•  A lot of hares
• Warthogs
• Lizard
• Bush babies
• Parrots

Each camp you go to, they will likely to have their own unique visitors. So while you might not need the 40-1150mm 2.8 so much on the game drives, you might find it handy in the camp or you could stick with the 100-400.