Chip Louie wrote: > > What body you mount the lenses on can make a big difference in perceived AF > speed. The EOS 1v is really fast the EOS 1n is only very fast, but the > particular lens models seem to vary in AF speed with different bodies for > some reason. > > For example, an EF 28-105USM mounted on an EOS 1n seems no faster than when > mounted on the EOS 5QD and EOS 50E bodies. When I mounted the EF 300 2.8L > on the EOS 50E the AF speed was much slower than on the EOS 1n. Maybe the > power supply makes a difference as I always use a power booster E1 with good > NiCad packs on the EOS 1n bodies I use.
Although I think Canons official word is, that the power supply won't influence focusing speed, my personal impression is different. Maybe they are right and it's just the fact that with the booster some things (mirror, focusing, film transport) work simultaneously while without the booster all is done sequentially?! Anyway, I have to agree with Chip that certain lenses (mostly the "big" ones) seem to benefit more from a fast camera like the 1N or 1V than others. The 80-200 f/2.8L is most definitely one of these. That may well have something to do with the central sensor of the 1N, which works as a cross sensor only with f/2.8 or faster lenses. Thomas Bantel * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
