My PZ20 exposes pretty much perfectly with screwmount lenses.
For that mater my old K100D did much better, when I shorted out the electrical contacts. Although I still wasn't all that impressed with it
With the PZ20, after shorting the contacts with tinfoil I now have a focus conformation beep, and light when focusing. Which at least helps me to focus. I was having problems with nice sharp landscapes otherwise.