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Your cart is empty.Size: 150x150mm, Focal length 140mm, Thickness: 2mm Material: PMMA (acrylic) Groove pitch: 0.5mm Transmission (%): 92 (from 400-1100nm) Index of Refraction nd : 1.491 Operating Temperature (°C): 80 (Maximum)
David Wei
Reviewed in Canada on March 21, 2024
It's made of high quality materials and does the intended work precisely. Good product at great price!
Dan Peterson
Reviewed in the United States on January 12, 2024
Disappointed. Not as pictured. This is an Inverting fresnel. The image on the viewers side is upside relative to actual object. Probably useful for applications others have. My application is as a fire starter for camping and long picnic hikes; a certain source for fire starting in case matches get wet. Or for increasing effectiveness of solar charger for my devices on a cloudy day. This is what is show in the picture I clicked on when I bought. We’re leaving country in a few days, so I don’t plan to fool around with a return for refund. I’ll probably look for a more reliable vendor. Simply not as advertised.
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