2pcs Prefessional Projection/projector Diy Kit Fresnel Lens For 5.6/5.8 Inch

Description

Brand Name: ZUCZUG item: fresnel lens for 5.6/5.8 inch lcd
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2 pcs prefessional projection/projector diy kit fresnel lens for 5.6/5.8 inch lcd
Details
2 pcs prefessional projection/projector diy kit fresnel lens for 5.6/5.8 inch lcd
Feature:
Item: Fresnel Lens
Front Fresnel Lens size: 148mm*90mm (including holder)
Behind Fresnel Lens size: 138mm*85mm
Front Fresnel focal length: 185mm
Behind Fresnel focal length: 120mm
Thread pitch: 0.1mm
Suitable for LCD screen size: 5.5 inches / 5.8 inches
Application: HD Projector DIY / HD FPV Video Glasses DI
Pakage include:
fresnel lens x 2 pcs(back+front)
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 minute refracting facet capable of bending light, thus giving greater transmittance than a conventional lens of the same focal length.
As early as the 18th century (1748), it is found that the traditional energy refraction lens only occurred on the surface and remove as much of the middle part, and retain the surface curvature, formed a thin flat lens, can still maintain good energy transmittance.
Fresnel lens to form a thin flat lens, its profile look like a sawtooth shape, but in fact every adjacent blade Angle is constantly changing, the Angle of the change is in order to focus light converge to the same place.
Fresnel lenses are most often used in light gathering applications,such as condenser systems or emitter/detector setups. Fresnel lenses can also be used as magnifiers or projection lenses.This Lens is also great for the fine print in books, magazines,maps,telephone directories,recipes,etc. This can really be a great and gift to children as a toy and senior people who need visual aid.
2 pcs Rectangle projection DIY fresnel lens for 5.6/5.8 inch lcd
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