On Fri, 1 Dec 2006 15:36:46 -0800, Henning Wulff <[EMAIL PROTECTED]> wrote/replied to:
>>You'll never convince me though that if the optical circle doesn't >>need to be so >>big, that the glass lenses used can't all be a bit smaller. Why do you think >>medium format lenses are all so fat? > >Because for the most part they're made with different criteria in >mind. Manufacturers know that people buy (bought) MF equipment for >high quality, so everything about the systems was optimized in that >direction. Weight and size were not the main concerns. Durability, >high sync shutter-in-lens are things of importance. Yes, and the Sigma made for smaller sensors is made with different criteria in mind, that's my point. It's made for someone who wants a thinner, lighter lens. That is the design objective they start off with and I guess they manage to trim it down considerably. Otherwise nobody would buy it. We haven't touched the optical laws of physics here though, about making a bigger image circle. I guarantee you it requires bigger glass not smaller and vice versa. -- 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 ***********************************************************
