Evrim Icoz pointed out
> http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=001spa which describes the EOS-3 having difficulty in focussing on periodic patterns. My eyes would have a similar difficulty when focussing on a bunch of periodic vertical lines with the old central split-screen system where you focus by aligning the upper and lower image. When looking only at the split-screen part, it is difficult to see which upper line belongs to which lower line. The camera has a similar problem. It tries to figure out how to position the lens to make two light patterns on the AF sensors match up. The sensors see only part of the periodic image and if it chooses the wrong lines to match up it will turn the lens to the wrong distance. You can probably help the camera by manually focussing sufficiently close to the correct distance and then starting AF. Hope this helps, Peter Wagemans * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
