Quote Originally Posted by eldarhau View Post
In photography that means everyone thinks they need big lenses (your 100-400mm), but 95% of your images will (most likely) be shot at less than 100mm (on an APS-C).
That depends on what you like to shoot. 95% of my wildlife shots are at 300mm on my 7D and that's usually not long enough. Even outside the wildlife realm I spend a lot of time in the 150-300mm range.

I'd invest in a general purpose zoom before an ultra wide. I took the sigma 8-16 to Asheville, NC. While it was a fun lens to use, it's actually very challenging to use effectively. I can't overstate how distant and small objects can appear if they aren't close in range.

The 15-85 or 17-55 f/2.8 are great alternatives. I love the 24-105L on my 7D too, but the wide angle limit is probably too restrictive for a trip to Peru.

Good luck and have fun!