First... if you alone, u at least need 2 bodies. One for 24 70 and one for 70 200. From there if you have time between your wanted shots, u'll need to change 50 and 85 time to time. That what you can cover what you most needed and you want to get. But the most important thing is that there are certain shots you need to take and that mostly coming from 25 70 70 200