Hi all, There has been some discussion on the effect of lens mount diameters on the ability to develop fast lenses. I think this is only one side of the medal, the other side is the camera register: the space between the film and the lens mount. The EOS not only has a large mount diameter, but also a small register. This is the reason that it can easily accept mount adaptors without optical elements for other brand lenses (including Nikon). The FD had a smaller diameter but its register was also smaller. That last fact seriously gets in the way of mounting FD lenses to EOS bodies, or Nikon bodies for that matter. Some very interesting information is available at: http://www.smu.edu/~rmonagha/bronmounts.html Just for your information. Rick Garrelfs ***************************** > > That's the point I was trying to make especially since Canon had 85/1.2 > and 200/1.8 lenses in the smaller diameter FD mount (does anyone know > how large it was in comparison to Nikon's F mount?) before the EF mount > came out. On Compuserve's photo forum, Chuck Westfall (Canon's > technical rep) even stated that larger diameter wasn't necessarily for > designing faster lenses but for greater flexibility in designing lenses > and greater structural integrity. > > Unfortunately, generalizations about Nikon's F mount are accepted by > some as truth. I remember not too long ago that people were saying that > Nikon's F mount made for slower focusing lenses. Rather than rambling > on and taking up bandwidth, visit my web page > "http://members.home.com/rdong" to read my thoughts on the matter. > *********************************
