Originally posted by bossa I bought a Silver AIV 31mm last week and it had horrendous lateral movement of the inner lens barrel. It was also soft wide-open so I replaced it and actually met the sales rep' in the store for the swap. The replacement was a black AIV unit which still had some movement (still more than I'd like) but much less than the silver one had. Without having touched any other 31mm LTD lens I cannot say for sure what the 'norm' is although one person here has stated that their lens has absolutely no lateral movement in the barrel. I have a MIJ 77LTD that I bought used a few months ago and that lens has none of these issues. Both the sales rep' and the store salesman told me that there's nothing wrong with the degree of movement in the second lens but that the 1st was definitely not right. It seems to me that any lateral 'tilt' of the lens is going to translate in the edges of the field being out of focus in critical shots so I tend to disagree with them on that point. If I return this lens it will be for a refund and not another swap out as there's no more stock of this lens in Australia.
Maybe we should start a poll to determine just how common these issues are?
Our FA31, bought from B&H, was very, very soft, but like 'Bossa' I've since then given up and moved on to Nikon-