Allow me to repost here for depth/frequency setting FovE$Dj]
The main fresnel lens types are: '8s>rH5[V
TA Ftcs:
* Constant groove depth. {V}t'x`4c
* Contant groove pitch types. &?SX4c~?u
KKLR'w,A>
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. c:=7lI
P7's8KOoS
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. &}vR(y*#c
Z7JKaP9{:
For conic: check conic section using Wikipedia and you should see what conic constant means. f'1(y\_fb
~c9>Nr9|`
L/H v4={