I think it's a bit of a stretch to pervert that perfectly reasonable liberty to cover stalking with specialized technology.
Legally justifiable (and admittedly for many good reasons), but ethically reprehensible. Like many things.
Even so the photos are still criminally boring.
I can't see how a telephoto lens could be considered specialized technology, given that they are extremely commonplace these days and are available from any well stocked camera retailer like B&H, Camera West, Adorama, Midwest Photo Exchange, Badger Graphic, Tamarkin, etc.
Telephoto lenses can be rented for a fraction of their cost these days, which would not be the case if they were truly rare or specialized. Additionally,the telephoto lens has also been with us for the past 120+ years; all this makes it pretty hard to make a legitimate claim that these lenses are some specialized, high tech wonder lens that is obscure and difficult to obtain.
...Most photographic history books credit John Dallmeyer with developing the first telephoto lens: he applied for a British patent in 1891...
Link:
http://www.lensrentals.com/blog/2011/02/who-invented-the-telephoto-lens
It seems pretty obvious to me that photographers are being unjustly accosted and screwed with too much these days as it is. If we were to declare by force of law that telephoto lenses are some sort of prohibited/forbidden technology for use in photography in the public venue or on the street, every photographer walking the street with a
"big" (by whose definition??) lens attached to his/her camera would be laid siege to (verbally or otherwise) by every police officer, rent-a-cop, wannabe lawman, security guard and do-gooder/busybody on two feet.
While I can't speak for all photographers in the U.S., I am decidedly averse to anything that remotely resembles such an arrangement.
I get it, though: A fair percentage of people just flat out don't like the type of work presented in this photographer's exhibit; they like it even less that it is within the law and is protected by the First Amendment.
That having been said, we don't get to arbitrarily pick and choose which parts of the Constitution we want to abide by and throw out the parts we don't like. The bottom line is this - the Constitution is the Supreme law of the land which transcends all other laws, treaties and court rulings, until such time when it is legitimately amended. Even then, the part of the Constitution which comprises the Bill of Rights (Amendments 1-10) is not up for negotiation.
There used to be an old saying, something along the lines of
"I disagree with your opinion, but I will defend to the death your right to freely express it." In a nation that is built upon a written Constitution, that same line of thinking has got to apply to street photography, which is Constitutionally protected form of freedom of expression.
Just some food for thought...