Photographers doing any commercial still, film or video work in National Parks in the US should be aware of new rules which take effect in two weeks time. They mean that a permit will be required and fees will be charged.
Fine Art and other non-commercial photographers should not be affected, but I've had enough run-ins with NP staff and rangers in the past to know that the sight of a tripod and pro level gear is going to elicit some heated debates in the days ahead. And, if you've ever tried to argue with a state trooper over a speeding ticket, you've already had a dress rehearsal for how those conversations are going to go.