Allow me to repost here for depth/frequency setting "Dwaq*L
The main fresnel lens types are: :vJ0Ypz-u
5}t}Wc8
* Constant groove depth. }EZd=_kAq~
* Contant groove pitch types. 2oFHP_HVfu
Lk|%2XGO&
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. )9QeVf
Xy(o0/7F9
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. 7R=cxD&
Zxwcj(d
For conic: check conic section using Wikipedia and you should see what conic constant means. L(2KC>GvA
g"iLhm`L
amn\#_(