I thought it was extra-low as well. See the def here:
http://en.wikipedia.org/wiki/Dispersion_(optics)
-Ryan
Graywolf wrote:
The opposite. High (or Extra, or Extreme) dispersion glass requires less curvature to obtain the same dioter. In a prism the colors would be spread farther.
graywolf http://www.graywolfphoto.com "Idiot Proof" <==> "Expert Proof" -----------------------------------
David Savage wrote:
Extra-low Dispersion I think.
Dave S
On Apr 5, 2005 9:11 PM, frank theriault <[EMAIL PROTECTED]> wrote:
<snip>
ED stands for what?
-frank
-- "Sharpness is a bourgeois concept." -Henri Cartier-Bresson
