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1pcs/lot big size 400*300MM Rectangle DIY projector Fresnel Lens Focal length 510 mm High concentrated lens

1pcs lot big size 400 300MM Rectangle DIY projector Fresnel Lens Focal length 510 mm High
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1pcs lot big size 400 300MM Rectangle DIY projector Fresnel Lens Focal length 510 mm High
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Price:  US $30.00 / piece
Sale price:  US $28.50 / piece


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1pcs/lot big size 400*300MM Rectangle DIY projector Fresnel Lens Focal length 510 mm High concentrated lens

Pakage include:

fresnel lens 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 minute refracting facet capable of bending light, thus giving greater transmittance than a conventional lens of the same focal length.

The Fresnel lens is simple introduction

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.

Classification of Fresnel lens:

According to its focus in different shapes, can be divided into point focusing Fresnel lens and line focus Fresnel lens.

Point focusing Fresnel lens:

Look from the front like a dart set, is composed of a ring a ring concentric circles:

Linear Fresnel lens is relative to the point of focus in terms of Fresnel lens, its positive shape look like shutter, look from the profile, Is also the point of changing the sawtooth shape, unlike disc Fresnel lens, this lens focus light to form a straight line:

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.

1pcs/lot big size 400*300MM Rectangle DIY projector Fresnel Lens Focal length 510 mm High concentrated lens

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DHL 3 - 7 days
UPS Expedited 3 - 7 days
EMS 5 - 14 days
Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).
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