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Nikon guy here but I should be able to help. SO...the zoom lens works with no problems? Take off the main lens and look at the part that mates to the camera body. You will see small copper contacts. Get a cotton cloth and some rubbing alcohol or Windex and thoroughly clean those contacts. Do the same on the camera body (it can't hurt to do this even though the other lens works fine). Then put the main lens back on and give it a try.Let me know what happens.I'll be here.