I use an old beat up camera or two - and I I put a note in it that says "please don't take my camera, it only kind of works and its all I have. If your picture was taken I do not care, I will delete it" so far that has worked. I don't put them on main trails or obvious places - most times when I do get peoples pictures - they don't notice it. I tuck them into tree crotches, but don't go out of my way to hide them.