Wife and I are going on our second cruise to Alaska May 15th on Norwegian up the inside passage. Last year on the same trip, I took along a T1i, 18-55, 70-200 f4 and a nifty-fifty. I had the 18-55 mounted most of the time with a few shots taken with the 70-200. This year, I'll be taking my 7d, 10-20, 15-85 and a 100-400. I expect the 15-85 will be used the most but we're scheduled for a catamaran excursion from Juneau up the Tracy Arm to the Sawyer Glacier where the 10-20 and the 100-400 will get used alot.