How about, if the Canon DO element is - instead of diffractive or Fresnell only - BOTH diffractive and Fresnell design? Just a wild quess again. One would assume Canon mentioning it in case that's the case. The first photo in Canon DO announcement at http://www.canon.com/do-info/index.html looks like there is no Fresnell design in it (reflections look smooth) but the light reflections in the second photo (element on the black background) are not smooth from edge to edge and actually look like there could be some wider "rings" as well. Could be of course just caused by the angle of the light in the second photo, in combination with a diffractive element. VP >Subject: Re: EOS Diffractive Optical elements > > > > > What are DO-elements? > > > Diffractive Optical Elements. > > > They may look like Fresnel lenses, but optically they are quite >different. > > > > No, and yes. True diffractive optical elements do not look anything like > > Fresnel lenses!! That's the problem! The Canon DO elements (or the > > schematic pictures of them) looked very much like Fresnel elements. Of > >Ok, I must answer myself... I just saw the page... while I remembered >correctly about the conceptual diagram, I can not really see the photo of >the actuall element at all (my work computer has only 256 colors and all >the photos are very bad) - but it seems that it does _not_ look like >Fresnel-lens after all. _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
