I was using this lens on a PENTAX K20D. I was using it until recently, so I've confirmed that it works. Both the focus ring and the aperture ring function properly. There are minor scratches from use, and some dust and debris that don't affect image quality, so please refrain from purchasing if you are overly concerned about these details. I will clean the front and rear lens elements, as well as the lens body, before shipping. Thank you.