Could be the little screws that hold the lens mount on the lens were loose, throwing the focus off slightly.
I had this with a Canon 2x Teleconvertor that suddenly seemed to have serious performance issues. Paul Wasserman >------------------------------ > >Date: Sun, 11 Mar 2007 11:03:08 -0000 >From: "Malcolm Stewart" <[EMAIL PROTECTED]> >Subject: EOS EF 300 f2.8L saga > >I bought an externally battered copy of this old lens about a >year ago, and quickly found that it was a "goodun", but that I >really needed to sort out my tripod head etc. for birding, >with a 1.4x or 2x attached. This took longer than I expected, >but last December I got a Manfrotto #393 gimbal head (despite >how Manfrotto describe it!) and I quickly realised that >matters weren't right. Eventually, I tracked it down to quite >serious lens front focusing, and took it in for service. They >warned about its age, and no guarantee etc. but quoted ~135GBP >for what they could do. I said "go ahead", but a few days >later they said the lens was far too old to fix, so I got them >to return it. >On return I did a few checks and immediately thought that it >was back to where it was on purchase, and now after several >visits to the local lakes, I'm convinced that once again it's >a "goodun". Some really excellent shots of mandarin duck >mating etc. (When queried, the repairers claim not to have >opened the lens, despite the tripod mount detents now being 45 >degrees from where they were....) Very relieved as the total >cost was around 12GBP. > >(I'm using it on a 5D occasionally, and mainly on a 30D for >birding. The 5fps is good for this application.) > >Malcolm >Milton Keynes, UK > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
