Anyone encountered this problem yet?
NEX-6 lens blackout/reset bug: Sony NEX Talk Forum: Digital Photography Review
Just realized that this was the reason why sometimes the lens seems to go bonkers, zooming in/out, trying to focus without success, and occasionally hanging the camera, requiring the batt to be removed and replaced back to recover.
It is easily reproducible by twisting the lens near the mount point, looks like the electrical contacts are quite flimsy and when this happens it shows F-- aperture.
I've encounter this with my Sigma 30mm. Sony 50mm F1.8 not too sure, but I think once as well.
what I will do is to, release the lens & relock back. Guess it's due to the contact points.
it's a bit annoying especially when u try to take a shot, but cannot becos it cannot focus...