I guess the main confusion of defining this lens is probably the setting of depth/frequency. BZ+ mO
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The main fresnel lens types are: $SzCVWS
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* Constant groove depth. )L <?g !j~
* Contant groove pitch types. L-C/Luws
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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. '}+X,Usm
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Hope this helps!!
