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I was there last year, but sorta didn't count, since I was in a huge cruise ship, not a smaller expedition ship. Antarctic law does not allow landing of more than 100 people at a time, so only small ships can do the zodiacs and landings. I call my trip a drive by shooting.
I would recommend taking everything, including the kitchen sink. Once you've loaded gear on board, that's it for the entire trip. You might have weight limitations going from Buenos Aires to Ushuaia, so I'd ask your airline about that.
You'd need the wide zoom for icebergs and scenics, and the 70-300L would be extremely useful for wildlife, with its wonderful 4 stop IS. You'll need a dry bag for zodiac landings. Take a face mask, and gloves that will allow open fingers, yet, close over to protect from cold. I got mine from Cabelas.
I'm showing La Boca, since if you don't know its there, you'd miss a good opportunity.
One surprise is the extremely bright light, due snow reflectivity. Most shots were at ISO 100.
don't disturb our nap!
Magellanic penguin (Ushuaia)
Colorful La Boca district in Buenos Aires