if i shake the lens a little in my hand i should not hear stuff rattling inside should i ??? picked up the 35-70mm nikon 2.8 lens used on ebay. at 35mm it seems to focus ok but at 70mm i am getting photos like this.. any idea what is wrong with it tried to do a AF fine tune but its just not working. the guy did say someone returned the lens because it had a back focus issue but he said on his camera there was no issue and the lens was as is. from that i though if anything the lens just needs a fine tune but its not a fine tune issue here. i am gonna tell him i want to return the lens. there is no possible way he tested this lens and did not find a problem with it. totally scammed..