GX7 AF behaviour: no big deal but weird

alcelc wrote:

rurikw wrote:

Paulmorgan wrote:

rurikw wrote:

Paulmorgan wrote:

rurikw wrote:

My GX7 is rather good at focussing in low light, at least leagues better than my former camera. But sometimes it can't lock. I recently ran into such a situation. Then I noticed I had EC on -1 or something which would result in underexposure. When I corrected that it also could focus. Of course it could have been that I'd moved the camera ever so slightly but I got curious and started experimenting with EC values in low light situations and there was indeed a consistent pattern: lower exposure and focus hunts, raise exposure and focus locks. Now I can't imagine any reason why these things should be connected. AF always works with aperture fully open so no way the intended exposure could influence its behaviour? Besides I was in A priority mode. Changing the (intended) aperture had no such effect on AF.

For focusing the aperture blades are always fully open, irrespective of selected aperture, unless its an old vintage lens with no communication.

Exactly. That's why thus phenomenon feels so weird.

Is all this with the one lens, seen similar from sticky aperture blades.

I'm not sure. I think I first encountered it when shooting nightscape with the 45-150. Last time I tried (successfully) to replicate it I also used that one. I tried to check the blades by looking into the lens while focussing and pressing shutter. Seemed to close down and open up normally. Could it be a firm/software thing?

What is your lens firmware?

No idea. Never bothered with it. Must try to find out.