The description says that the lens has an all metal lens barrel. But, what about the lens mount itself? Is it metal or plastic? +
I am getting a communication with lens error alert from my camera. If I turn it off and remount lens it goes away, but comes back constantly. Any advice? +
This lens does not have any data to pass to the camera. It’s completely manual.
Does it come with a lens hood? +
No, it does not come with a hood.
On a full-fame sensor, this will be an actual 35mm focal length, correct? And on an APS-C sensor it will be more like 56mm? +
That is correct. The lens will be 35mm on a full frame and the equivalent of 56mm on an APS-C sensor.
Does it have automatic diaphragm stop-down with the K-1? +
No automatic aperture on this lens.
Does this lens integrate with the Pentax KA mount system for metering? Specifically, does it function or have the functional "A" on the aperture ring? +
The Mitakon Zhongyi Creator 35mm f/2 Lens for Pentax K Mount is a fully manual lens. It does not have electronic contacts for communication with the camera and does not have an “A” mode built onto the aperture ring. The lens will fit the Pentax K-mount, but you will have to focus the lens manually and set the aperture using the aperture ring on the lens, not the command dial on the camera body.