> Hi, Before you send the lens back, try focusing a little further away. I don't have a 28, but I don't think it will focus as close as 12 inches. Check Page 92 of the camera manual: "If the mark (focus indicator square) blinks on the right side of the Focusing Indicator, the shutter does not trip when the dirve moe is set to "SAF" because your subject is too close to the camera. However, when the drive motor is set at "CAF", the shutter trips although the subject is not sharply focused." IN ENGLISH: In "Single Auto Focus" the shutter will not fire if the lens is not in focus. But, in "Continuous Auto Focus" the shutter will fire even if the subject is out of focus.
Sending stuff back to B&H is a pain. They take forever and you have to hound them to death. Their after-sales support sucks. If you do have a problem and your equipment is under warranty, you much better off sending it to Contax in New Jersey, or elsewhere. I have found their service to be excellent, courteous and fast. Good luck. Art P.