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<p>One other thought, on European trips where I carried the 7D, I have bought 28-300mm lenses from Tamron, used them for a week and then sold them on eBay when I returned for a little less than what I paid, sort of like renting them I suppose. Sure, I'd love to have one from Canon but can't justify the cost for travel photos. And yes, we also do the bound photo books for each trip.</p><div></div>

<p>Ha, faced the same question in years past. On one cruise, I took my 24-105 and the 17-40 but missed having something longer. Last cruise, I ended up buying a Canon SX50, 12mp and has an effective optical zoom of close to 1200mm! Didn't miss a thing and was able to carry it everywhere (tours of the Acropolis, etc.) Far lighter than a 7D and two L series lenses. Only thing extra might be a monopod and case for the camera. </p><div></div>