Originally posted by urssu As the title says, I tried shooting with a Metz 58 AF2 and in the live view it shows -5 exposure. The photo is a maximum -1 underexposed.
Are you saying that you are puzzled by the difference between what LV is telling you (-5 EV) and what you are getting as a result (-1 EV)?
It is normal for the camera to show you the exposure that would result if you did not use a flash and for the result to be (close to) properly exposed because the camera then used the flash for the actual exposure.
In both "A" and "P-TTL" mode, you'll get automatic exposure ("A" -> the flash does it own its own, "P-TTL" -> the camera does it with the help of the flash). In "M" mode your exposure will depend on the power level you are setting on the flash. Do you not see a corresponding difference in your results?
P.S.: The K-5 has a P-TTL flash exposure problem (only finally fixed in the K-3), however, that only occurs in specific conditions and I don't think your issues have anything to do with it.