The Pentax K-1 is probably the greatest thing to happen to many Pentax users in a while; and when you consider some fantastic lenses like the company's Pentax 15-30mm f2. 8, you start to see more and more how someone could almost want to switch systems.
The Pentax 15-30mm f2. 8 is a weather sealed beast of a lens that works very well with the Pentax K-1 and is designed for landscape, architecture and Real Estate photographers. But it's also a generally great walkaround lens if you're the type that enjoys shooting wide. Like all wides, it can also be used to deliver a very unique perspective when shooting portraits. . thephoblographer.com