Fresnel lens for 5.5 inch projector 148mm*82mm F185mm and rear 138mm*100mm F100mm DIY projector fresnel lens kit, 2 pieces Package include Front 148mm*82mm F185mm 1 piece (with bracket ) Back 138mm*100mm F100mm 1 piece A series of concentric grooves on a flat, thin piece of plastic makes possible a large diameter, lightweight and inexpensive lens with a short focal length. Each groove acts as a tiny refracting facet capable of bending light, giving greater transmittance than a conventional lens of the same focal length. Product specification Material: PMMA No groove : 0.1mm Transmission (%): 92 (from 400-1100nm) Operating temperature (&deg;C): 80 (maximum) Application: DIY HD Projector / HD FPV DI Video GlassesMaterial is Acrylic with 92% transmittance across the visible spectrum. Maximum service temperature is 80&deg;C. Real Images About Payment We will have more of payment methods About shipping About feedback If the package received is not satisfied (damaged parts/broken parts/wrong parts/cannot be used), please contact us first, we will try our best to solve the problem with you. 5.5 inch projector fresnel lens 148mm*82mm F185mm and rear 138mm*100mm F100mm DIY projector fresnel lens kit, 2pcs< br>