--- Tom Christiansen <[EMAIL PROTECTED]> wrote: > is concerned. The > lenses that allow full-time manual focus seem to > focus significantly > faster than the lenses that don't. At least that's
Hi Tom, That is probably (meaning: almost in all Canon EF cases) is due, in large part, to Ring USM lens drives. Non USM lenses or ones with Micromotor USM would be slower in AF, IMHO. Ring USM would mean a faster or a "snappier" feel to the AF speed, comparatively speaking. Other factors I think that would contribute to that would be the weight of the lens assembly and design parameters etc. - Harman __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
