I'm looking for an old Pentax, or any third-party K-Mount lens, preferably one with AF (for my K-50) I'm currently at the newbie stage where I have an 18-55mm kit lens, along with a Nikkor 50mm f/1.8 Ai-S lens, picked up from my Grandad's old kit. Miraculously, by the way, they fit inside the K-Mount, though I'd like something a little more suited to the focal distance and specific mount, albeit a nice temporary novelty. I'm looking for a 35mm or 50mm prime with a maximum aperture of about f/2 that's sharp and has nice bokeh. Also looking at an older telephoto lens for my wildlife photography. Again, preferably AF but I'm open to manual focus too Now I know these lenses can be picked up dirt cheap and you can get excellent results with them. I'm on a tight budget so I'd like to try something cheaper that still gives me excellent quality. Any suggestions?