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What are Fresnel lenses used for,Why are Fresnel lenses expensive,what is the advantage of Fresnel lens
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Glass Fresnel lens VY Optoelectronics Co.,Ltd.
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LED Lens VY Optoelectronics Co.,Ltd.
VY Optoelectronics Co.,Ltd.
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High quality 56mm diameter 3mm thickness optical glass half dome lens for underwater photography in stock - AliExpress
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