>>> fotofx@xxxxxxxxxxxxx 4:27:22 AM Monday, April 05, 2004 >>> Even on my 70-200 2.8L I have seen differences in the focus during hot weather... Les Baldwin I don't see how this can be since the autofocus still has to focus to a sharp image. All it means is that the lenses would move farther out (or farther in) than in a cooler enviroment. Isn't the sharpness determined at the sensor plane? Please enlighten me. Bill
