Greetings JillieKL,
I'm heading to Alaska next month. Never been to Iceland, but it should be easy for you to do research on what to see. John's reference looks great and tripadvisor will have some good tips as well. I certainly have an affinity for the 6D2. Its in my study, carefully stored in its box with a few of my favorite retired EF lenses.
I'd really like to see you take one other lens. How about a 50mm f1.8 or the f1.4. (new $125 or $349) B&H. You could probably get either used from KEH too. Either will capture double the amount of light your f4 can, and you might find yourself in a lower light situation when inside. Outside is light from 0430 to 2230. Make sure you have multiple memory cards and batteries. We will look forward to seeing some photos upon your return.
~Rick
Bay Area - CA
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