Originally posted by krypticide So here's a question: the aperture seems to read correctly as well as the focal length, but when I look at images in Lightroom, there doesn't seem to be any lens information. It just shows focal length and aperture.
With my Tamron 18-250mm, the lens name reads correctly. Does this have anything to do with the fact that the lens is new and somehow the name can't be read by my K10D? Or is it related to the loose mount?
All lens info and focal length, focusing distance etc comes through the communications pin, I'll call it pin 7, the furthest away from the lens locking pin. If this pin does not connect, the lens probably does not autofocus either.
you can clean these pins with a soft pencil eracer, but make sure NOT to use the type which are hard and aprasive.
for people who have screws coming loose (I mean in the lens of course
) you might consider a bit of removeable loctite, assuming the lens is no longer under warranty. If it is under warranty take it in and have sigma look at it.