skism
To use the FA*300mm f4.5 ( and I have one) in MF, you need a dual action:
(1) Switch the camera mode to MF, and
(2) Push the FA* focus ring to engage the MF. I mean push the ring away from the camer body. You will see a line 'Manual Focus' appearing above the line 'Auto focus' seen in your picture.
Then you can MF the lens.
The FA*300mm f4.5 is an awesome lens. The IQ is outstanding.
From my own experience, I prefer to use the lens in AF. The MF ring is not as precise as in true MF ring. (I have some VL and CZ lenes with very accurate focus rings.) When combined with the K-7, the camera in Hypermode (P) sometimes jump the ISO (too high). At dusk and dawn, I tend to set manually the ISO on the K-7. (The K-5 may not have this issue.)
Overall a great lens. I bought mine (over the DA*300mm f4) for the smaller size and the absence of SDM. I work often in the bush, backpacking and bushwalking. The weight of the lens together with the risk of SDM failure are both real issue, hence my selection of the FA*300 f4.5.
Hope that the comment will help.