I'm not sure why you're trying to use AI Servo on a stationary subject; it's intended to be used on MOVING objects.
Read here: http://photonotes.org/other/ai-servo.html and note the first sentence in the conclusion "was designed to function as the finest central-area autofocusing system in the world for moving subjects". It's also not clear which AF points are active on the cameras you're testing with. Is it 35 points on a 1-series, or a single center point, or something in between? From what I've read, I don't think there's a problem with the lens. Tom P. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Joerg Thomas Klein > Sent: Tuesday, January 10, 2006 12:31 AM > To: [email protected] > Subject: Re: EOS focus hunting on 70-200 > > > Servo mode needs a subject to be locked on, and bland > subjects of low > > contrast are not good for that. > > I used a tripod and was shooting a traffic sign in white and > blue. On a second try I shot some tree branches against the > sky. In both times the image in the viewfinder is sharp but > the af is hunting like he could not find the right tooth of a > gear wheel. > My problem is that I would like to buy this lens as an > replacement for a old Sigma 2,8/70-210 APO which does not > have this problem, but is not usable on a the 350D. > If I need to pay some money to repair the Canon 2,8/70-200 > the I would give the lens back and look for another one. > > Thomas * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
