I must admit this forum on Fresnel Lenses is extremely interesting. Before I attended the HL Reunion in Providence last year, I didn't even know that "Fresnel" is pronounced "Fru-nell".

How about one of you fine informative people taking a moment to list all the orders of Fresnel lenses with their dimensions. I'm sure there are many readers of this forum that would find it very interesting, including myself.

Bob