Allow me to repost here for depth/frequency setting '{2]:
The main fresnel lens types are: QZ&(e2z
*,Bm:F<m
* Constant groove depth. m&gd<rt/
* Contant groove pitch types. j<~Wp$\i7>
f/J/tt
So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. Ge`7`D>L
j_2g*lQ7a
For radius, this is the curvature of the base surface. If you define one such lens and chaneg the radius and you shall see what it means. A graphic tells lounder than words. )oCL![^pXe
l48$8Mgrr
For conic: check conic section using Wikipedia and you should see what conic constant means. h]s6)tII
gw"cXny
Hq}g1?b