[hdesbois]

The concave element, I suppose, is just here for focusing purpose, allowing for a more compact design. Consider the lens system to be the equivalent of a single (convex) lens. With all the trouble with Maxwell and dielectrics, I guess you'd better experiment with a single lens.
HD

[fil]

hi all, i have find an excel file for projector build

say me how i can give you this file

zz_ole_zz@hotmail.com

[jomaga]

Hey, fil, thanks!
could you send it to me at jose@huidobro-martin.com ?

[fil]

ok...i have send it^____^