Hi, Ray: The EOS-1D uses the same AF system as the EOS-1v, in fact they share the same components. Therefore, the EOS-1D supports central-point AF with EF lens/extender combinations having an effective maximum aperture as small as f/8. This would include combinations such as the EF 100-400/5.6L IS USM + EF 1.4x or the EF 300mm f/4L IS USM + EF 2x.
Best Regards, Chuck Westfall Assistant Director/Technical Information Dept. Camera Division/Canon U.S.A., Inc. - All outgoing e-mail is scanned for viruses by Norton Antivirus 2002 * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
