We are on a short vacation in a very scenic state park - they have an old stone tower with a metal water storage tank on top - very rustic - I wanted to practice photographing the tower so I went to the rangers office to get clearance to do so - since the park is virtually empty they agreed to allow me to photograph various features in the park. The one thing I found really interesting is one ranger was really focused on privacy issues - he requested I keep other folks out of the pictures - I replied I would do my best - I wonder if anyone with a 35MM has had the same request made - but overall the rangers were interested in what I was up to.