I personally visited your web site http://www.exploratorium.edu/snacks/giant_lens.html and loved the great information regarding Fresnel lens theme.
I thought you might be interested to know that I have a web site www.3dlens.com with same Fresnel lens subject.
May I ask If you can put a link for key phrase "Fresnel Lens" to http://www.3dlens.com, however, I would like to send you a large fresnel lens #A260 below as a Thank You Gift.
260mm x 260mm
Weight: 160 grams
Material: optical acrylic
Groove pitch: 0.2mm (127 grooves per inch)
Focal length: 200mm
I am hoping that you might consider linking to us
You prefer to add a reciprocal link with each other at www.3dlens.com/links/index.php
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