> > How can a 1000mm lens NOT be a tele? I don't understand. > > keith whaley
Strictly speaking, a telephoto design is one where the overall length of the lens is shorter than its focal length, so the early 1000/8 and 500/5 were not telephoto, but "long focus" lenses. The later versions where shorter than their respective focal lengths and are thus true telephoto lenses. I suspect this may be true of the early 300 and 400 as well and probaby most of the cheap two element 500/600 lenses that clutter up the eBay listings. Paul Ewins Melbourne, Australia
