Malcolm Stewart wrote: > I too have noticed that my (old) EF 85 f1.8 seems relatively > sluggish in > comparison with my EF 100 f2.8 USM (over comparable ranges). > Others have found > just the opposite. I wonder if USM motors gradually gather > (very) fine dust as > they age, and whether this has a long term effect on AF speed? > > Some years ago, I met a golfing photo pro who had found his > USM lenses had got > gummed up by fine sand when he was shooting a tournament in > the Gulf States. > Since then Canon have improved the sealing on their premium > bodies and lenses. > Just a thought... ---------------------------------------------------------------- How old is your 85mm F1.8? Mine seem to have execptionally fast AF. Perhaps you need a CLA on yours if that is the case. It should not be sluggish at all.
Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
