I know it's been asked a couple times, but I wanted to get opinions on anyone who's done an Alaskan cruise recently. I'll be using a Canon 6D, so it'll be FF so I won't have the default zoom factor of a crop. I'll be taking my 24-105L, and am looking to rent a zoom. I was originally thinking of renting a 70-200 2.8 (I've always wanted to try one and this seemed like a good excuse), but from reading other people's experiences, it sounds like this won't be enough of a reach. I've heard good things about Canon's 100-400mm, does anyone have an opinion on that? Also, with 24mm on the low end on a FF, you think that's sufficiently wide enough? Or should I look into getting a UWA as well? Thanks!