Is Panasonic 12-35mm II parfocal?

hindesite wrote:

Why?

Doesn't the example show the possibility (which is my assumption) that the lens manages it own corrections of focus to maintain parfocality; after all, these lens know their own characteristics and could adjust accordingly (just as they used to do using mechanical designs in the past).

Nothing to do with the camera body for this function; AF is not involved.

The lens can't power its AF motor by itself. Nor does it have an advanced processing engine on board typically. In order to keep shifting the elements around to maintain parfocality, somebody has to apply precise amounts of electrical current at specific moments. It seems unlikely that a lens would be allowed access to power on demand without the body provisioning for it.

Furthermore, the more likely scenario is that the amount of current required has to be judged on the basis of the projected image rather than focal length change. Seems reasonable to assume that as you're zooming in and out the body adjusts focus accordingly to maintain maximum contrast at the original focus plane.

After all, if manufacturing tolerances were so precise that all copies of the same model lens have the exact same focus drift when zooming in and out that the same preset amount of power could fix it, they might as well be truly parfocal in the first place.

But this is all conjecture. If somebody knows what's the actual inner workings of the system, I'm all ears. And the speed at which the adjustment happens also had me wondering if it's a DFD thing. Not sure if it's full on CDAF happening at that moment, fast as it might be. If Oly bodies do it too, then it's obviously not DFD. Might be the lens by itself too, as you say. Really don't know.