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Hi Greg,
My first idea was to purchace a Pentax 67 400 mm ED lens, but more then five times more expensive compare to the Pentax 645 300 mm ED I have. But even worse, the few reviews of it told that it's softer then the 645 lens.
One more clear night and I think I have the tilt problem fixed.
Do you use your Pentax 645 300 ED wide open ? I use mine at f/4 not as sharp as it can be at f/5.6, but with the bad atmospheric condition here it's enough.
Mamiya 67 also have some APO lenses, but difficult to use because the focus mechanics is hold in the camera house. But the quality are fine what I have read, but no astrophoto reviews.
/Lars
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