You-by-Lou wrote in post #13317668
your xsi is a full 12oz lighter,(i think) food for thought
the 1-4 is at 3 lb...so you could look at carrying just over 4 lbs vs 5 .
Well, I plan on taking both. I've had a camera go bad on me in the Galapagos and having an extra (then I traveled with 2 XSi's) was a godsend. I'll even have a little point and shoot as extra insurance. Actually, I expect I'll use both, with different lenses attached, depending on the plans for the day. Changing lenses in the dust of the Serengeti seems like it's asking for trouble if it's not necessary. Most folks tell me to bring a sensor cleaner and to presume I'll need to use it. I plan on following that advice .
Someone wrote a great article on a trip to Africa which basically said: think about the things you need as a photographer. For each item: if it broke and could not be repaired, would it ruin your trip? For him, the answers were pretty consistently "yes" so he had back up plans for everything. I expect I'll try to come fairly close to that standard.
Weight wise it will be a fair amount of stuff to transport between continents. But in Rwanda for a few dollars a day there are porters to carry while we trek to the gorillas and in Tanzania all you really have to do is get your stuff to the jeep each morning. Not fun but doable. After that it should be no worse, and in most ways, an amazing amount better, than a standard day out with a camera and a lens . I won't be hiking in Tanzania. Someone else drives. I don't need to be a map reader or even set up a GPS. I just think about the photography and experience what I expect will be amazing! I can't wait!!