Coming from the K10D I just got the K-5 and am loving the AF Fine tune (am loving
a lot actually
). I just ran through all my AF lenses and a few MF lenses. I found a very peculiar thing when tuning my AF 50mm f/1.4. As I stopped down from f/1.4 to f/2.8 to f/4 the focus point would move forward. So I couldn't dial in one number to offset focus and have it be reliable across the lower f stops.
So I ended up tuning to f/2.8. The center of the focus region at f/1.4 is ever so slightly behind the focus point (while still reaching to the focus point), and at f/4 the wider critical focus region averages slightly in-front of the focus point (where the actual focus point still falls within the critical focus region.)
Now this may not be news at all and may have been widely discussed and known to many when the K-7 came out. If so I never read it; I'm sorry for my ignorance if so. But maybe not. In any case, is this something others see as well?