I know it's off topic, but I visited Iceland once, 9 years ago, and took a 7D + 100-400mm (original version) and got this shot of a Tern feeding its chick in Reykjavik. The zoom was necessary as I had to zoom out and got good depth of field. I'll bring the RF 100-500 if I visit again.Yes you'll be fine with the vaccine for custom purposes after the 1st of may
And yes I don't doubt that 400 f/4 gets you sharp shots on puffins, but maybe hardly on bigger wingspan birds. Anyway as the background (sky or sea) is far away, it won't make any improvement on the picture to make it at f/4 IMO.
See you on the cliffs somewhere![]()

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