Originally posted by RobA_Oz No auto anything, not just auto-focus, so why not in K-mount, I wonder?
Samyang usually makes full frame, manual focus lenses. The K-mount variants have A-setting on aperture ring, so there is some automation. You can choose aperture on the camera, use Av mode, get automatic metering (don't need green button like K and M series lenses) and so on. And with CiF (catch in focus, focus trapping), you get pseudo-AF. And Live view with focus peaking is helpful as well. Its not a completely manual lens like.. um, Mitakon 135mm.
The lens will probably come in k-mount, even if it is not announced right at the beginning. Especially if Pentax actually delivers a FF lens, since the 135mm focal length is typically a FF focal length. Then again, Pentax is missing a 85mm as well