Originally posted by GregL564 ...
• The K-1 and the 60-250, which gets me to 250mm (although not thrilled with the image quality)
...
I couldn't help wondering whether you've gone through the autofocus fine adjustment ("calibration") procedure? If it works great on the KP but not on the K-1, that suggests that it's the relationship between the camera and the lens that's at fault, not either one specifically.
Also, have you considered the use of a teleconverter?
By the way, having similar interests, myself, I'll tell you what I use. I ditched the KP for landscape use - I mostly use it for birds, flowers, bugs (macro) and indoor use, though it's formidable with the 11-18 DA* on it. But for mountains, woodlands, and such, I use the K-1 (original) with the following:
Irix 11mm f/4.0;
HD Pentax-D FA 15-30mm F2.8 ED SDM WR;
HD Pentax-D FA 24-70mm ED SDM WR Lens;
HD Pentax D FA* 70-200mm f/2.8 ED DC AW;
HD Pentax D FA 150-450mm; and
Pentax DA 560mm F/5.6 ED HD AW.
Obviously, I would be fairly selective depending on where I'm going, and seldom take more than three lenses with me at a time, only one of which would be one of the longer jobs (too much weight otherwise).