Allow me to repost here for depth/frequency setting Vc_'hz]Z
The main fresnel lens types are: FQm`~rA~zt
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* Constant groove depth. jB`,u|FG
* Contant groove pitch types. j!_;1++q
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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. .>CPRVuVI
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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. 5XO;N s
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For conic: check conic section using Wikipedia and you should see what conic constant means. [.m` +
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