Allow me to repost here for depth/frequency setting G>[
NZE
The main fresnel lens types are: %TW%|"v
[V2omSZo
* Constant groove depth. 43{_Y]
* Contant groove pitch types. 4Wi8$
`bZ2x@
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. kyRh k\X
5D]30
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. 2|0Qk&
}DDVGs[
For conic: check conic section using Wikipedia and you should see what conic constant means. R8=I)I-8
[xZ/ZWb/
{8!ZKlB