Very pretty, very large and very rare, at least in captivity. In Europe it's not kept anymore at all ! So you were quite lucky to get it for your camera.
Unfortunately, I did not take a lot of time viewing the bird. I only have one picture that is any better than this, I'll post it right now, with others that I was unable to sort out earlier. Thanks a lot for the information. I will take more notice of it when I visit again (and that date will be as soon as I can after they put the Topi in the Savannah)