Plan to spend $300-450 on a thorough top-to-bottom CLA/overhaul. I had my 2.8E overhauled recently at a local shop and it was $450, which included re-aligning the front lens panel because at some point in the past my camera had taken a knock to the head and the front lens bearing standard was out of whack, and you couldn't reliably focus it wide open. Once you got past f5.6 the depth of field covered you, but at f2.8, nothing was ever really as sharp as it should have been.