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| p.1 #5 · Colorado River - Grand Canyon Lens Advice |
If you are limited for weight, I would stay with the three lenses you mentioned, and would never consider leaving the 16-35 behind. You did not say if your 16-35 was a II version, which is nicer than the original, but in either case you want that lens along. There are a lot of shots where you have no time and/or no possibility to "foot zoom", so the real zoom lenses you are taking are ideal.
I think my raft trip down the Grand Canyon was mostly shot with my 16-35 and my 24-105 on a 5D, with only occasional need for my longer zoom. I had nothing wider than the 16-35 along, but I doubt I would have made use of a 14 if I had one then. You did not mention if you will have a good tripod along, but if I was taking a 17mm TS-E lens I would for sure want a tripod. For hand held shooting the 16-35 is likely as good a choice as the 17. Also remember that a TS-E lens is not really sealed at all, so the risk of moisture or sand getting in at the tilt or shift areas and causing problems with an expensive 17mm TS-E is another factor to consider.