Focusing problem When I turn the focus ring from infinity to the close end stop, the lens 'slips' while racking out and ends up only about halfway between infinity and the closest 1:2 setting ..is it worn out or something I can fix?. thanks for any help offered. I bought it on Ebay and it seemed to work fine at first when I got it,Robert

SOURCE: auto focus problem

My first suggestion is to send it back if it is under warranty.

The grease probably got so thick, from the cold, that it caused too much resistance for the auto-focusing mechanism. You probably have damaged the focusing mechanism in the lens. You cannot repair this, yourself. I don't know how cold is too cold but it really shouldn't have done that.... Tamron makes cheap lenses. Try and exchange it for at least a Sigma.

SOURCE: bought a tamron 28-300mm Di LD lens for my Canon

Nothing you can do. The Tamron is not compatable with your camera. So the focus will be slower

SOURCE: It is brand new Tamron 28-75 f2.8 for Sony mount.

Hi,

You should turn the aperture ring on the lens toits smallest setting (largest f/number). If the ring has a lock, lock it inplace. You control the aperture from the camera body, just as you would on alens with no aperture ring.

Let me know if you need more information


Thanks