I'm guessing it's a Tokina.
Hmmm. The Tokina even claims to have a special coating to repel "water or fingerprints."
It's sad that a flagship lens is actually, pretty much, not a Pentax save for a few bits on the outside. And, clearly this is something Pentax needs to address.
There're also a lot of lenses on the Tokina page that make me really wonder who's making them for Pentax - there's a 35mm f2.8 macro, a 12-24 f4 ultrawide, a 50-135...
Very depressing. Do Pentax still make
any lenses? It seems a clear-cut case of dodgy outsourcing.