Judging by these close-ups of the lens mounts of the 10D and 300D from dpreview, it seems (to me) that the mounting flange (i.e. the metal mount) is identical, but the mirror box on the 300D has a recessed section that is missing on the 10D. It's purpose would seem to be to allow lenses with a greater back-spacing to physically fit into the mirror box opening - there seems no change to the rest of the mounting system (the bayonet mount and the position of the electrical connectors).
Does anyone know if this is the extent of the -S addition to the EF mount? My only question then is why is there an additional indexing mark (the white dot [well, square])? See: 10D: http://www.dpreview.com/reviews/CanonEOS300D/Images/lensmount02.jpg 300D: http://www.dpreview.com/reviews/CanonEOS300D/Images/lensmount01.jpg Cheers Gary This message has passed through an insecure network. All enquiries should be directed to the message author * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
