Please make sure your camera and this lens is comparable to each other, this lens or any other third party lens will not have full function with all camera’s. Sigma, Tamron, Promaster, Tokina, etc are not OEM lens, not to say they are not very good lens and work excellent, but just make sure you are buying the correct lens. All these lens have been tested on the correct style/age camera and work fine. Any issues will be listed