It’s not a good idea to get too close to a turkey vulture in an attempt to get a close-up photo.
Turkey vultures are good at vomiting. They can project their vomit as far as 3 meters (almost 10 feet) to keep intruders at bay. And their vomit is particularly strong—smelly and highly acidic. Worse, turkey vulture vomit can contain bacteria that can be harmful, even deadly if ingested, to other birds and mammals.
In addition to smelling bad and being potentially poisonous, vulture vomit can be corrosive enough to burn skin.
Because of this defensive adaptation, vultures are quite tolerant of people getting near to them. When they’ve got food in their stomachs to vomit, they’ll often let a person walk (or paddle) close. (I’ve gotten pretty close myself slowly, definitely closer than 3 meters.) But it is not a good idea.
You’re safer seeing them from a distance.