Until now I didn't use my Metz 52-AF1 with the K-1. But you made me curious.
So I just did some simple tests in K1-FF mode, flash attached to the camera.
Camera settings:
- program AV
- flash compensation 0, -1, -2 (one after the other)
Flash settings (firmware 1.3):
- P-TTL mode
- no flash compensation
Results of the tests using a prime and a zoom lens:
DFA100WR
All three exposures are pretty good and brightness of the images reduced with every ev compensation step.
DA18-135WR
Sorry, until now I don't own another autofocus zoom lens. As I said I used K1 FF-mode and presume that electronics of DA and DFA lenses work the same.
The tests showed the same perfect results like using the DFA100WR ... ok ... difference is the dark image circle (DA format on the FF sensor)
Changing focal length resulted in automatic zooming of the flash and the flash's display showed the correct focal length in its boundaries 24-105 mm - works as expected.
I often read complaining voices about Metz flashes on pentax forum. Maybe there are configurations depending on lenses that don't work fine or other Metz models suffer. But until now I cannot confirm.
The Metz 52-AF1 seems to work very well on my K-1!