On Sat, 02 Dec 2006 12:13:30 -0500, Bob <[EMAIL PROTECTED]> wrote/replied to:
>The size of the aperture is the focal length divided by the expected f >number, ie: 400/2.8 etc...... > >Physics says there will most likely not be a 400mm f/2.8 with a diameter >of 50mm or less. True, but the aperture is only one small part of a lens. There's a whole lot of glass lenses inside that do various things, one of which is form the image circle. It has nothing to do with the aperture. -- Jim Davis, Owner, Eastern Beaver Company: http://easternbeaver.com/ Motorcycle Relay Kits, Modulator Kits, Powerlet, Centech, Posi-Lock, Parts. 1988 K100RS SE ABS in Japan. 1991 ST1100 in America. STOC#6327, IBMWR, KBMW * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
