Cool Kobie!
What was the trouble with your 150-450?
Thanks! As for the 150-450...
According to Sun Camera (official Pentax repair center in Ontario Canada) they state it seems to be a firmware issue.
Since the lens was loaned to me, the owner had updated to the latest K-1 II firmware (the other lenses have been fine and the 150-450 worked fine prior to the latest firmware). The only lens they loaned to me that had been mounted to the K-1 II with the lastest firmware was the 150-450.
Since the firmware controls the electronics for the aperture, something with the K-3 III firmware corrupted the lens at its max extension of 450 mm since at the max extension the aperture drops from 5.6 to 4.5 and at that moment, the lens also fails to focus. I've tried it on my K-3 as well with the same results.
They suggest trying to mount it back onto the K-1 II with the very slight possibility that it may fix the issue.
I'll be giving the lens back to have Sun Camera check it out and go from there.
