2 pcs/lot Diameter 50mm Focal length 55 mm fresnel lens for DIY google cardboard VR Box 2.0 version virtual reality 3D glasses

Product Description :

2 pcs/lot Diameter 50mm Focal length 55 mm fresnel lens for DIY google cardboard VR Box 2.0 version virtual reality 3D glasses

When you need other size or other focal length fresnel lens that please chat with us in any time!:)

        Different types of lenses are used on different productsm,when you need

    them that please chat with us in any time!        

_________The Important explanation:
If you want to buy the Fresnel Lens to DIY the simple projector,when you buy them before that please read the Explanation:).
If you hope when you DIY the simple projector that you can got a Professional projector or hope the projection effect like the Professional projetor ,please read the words :
When you used the Fresnel Lens or the magnifying glass to DIY the simple projector that the goods just can prove the projection principle,some times due to the brightness for the Mobile phone and some other factors that when you DIY can’t got the Professional projection effect,the phenomenon is normal,because the brightness for the Professional projector is 200~300 Watt,but our mobile phone just have hundreds of milliwatts,Hope you can understanding the reason for the  gap between for the DIY and the Professional projector.
_________Some Person will fell so strange:What is the Before and after Fresnel Lens? 
The construction for all Lens machine is Before and after Fresnel Lens be sell In the marketplace,it is can  perfect corrective and magnified effect of image.
But some mobile phone or PAD or some LCD panel can support the single Fresnel Lens so you can choose by yourself.

__________Notice:

The location for the Before Fresnel Lens:It is 
Close to the camera installed between the lens and LCD screen.
The location for the After Fresnel Lens:It is Installed between the bulb and the LCD panel.
__________Friendship tips:
When you need let the Fresnel Lens become to  smaller or drilling,please on the side of Smooth the surface to Prevent damage of Fresnel lens rupture,the Trapezoidal correction range can’t too big that will let the picture breezing.

The Fresnel lens is simple introduction

Fresnel lenses are molded from precision optical-grade acrylic.The surface of a Fresnel lens is molded into many circular,concentric ridges.These circular ridges give the Fresnel lens a zigzag or sawtooth cross-section.Each sawtooth creates a tiny prism.Fresnel lenses are a compromise between efficiency and image quality.High groove density allows higher quality images.while low groove density yields better efficiency.By choosing appropriate powers for these prisms,designers can define the focal length and control image quality.LED magnifier, fresnel lens solar energy, rear projection fresnel screen,fresnel solar concentrator,fresnel magnifier,camera fresnel spotlight and so on.

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 creative gift to children as a toy and senior people who need visual aid.

The  following announce is suitable for all the customers .

Before purchase your order  , Please take one minutes to read below regulation  .

It will help us a lot to make the business more easy and goes smooth :

1. About shipping 

A DHL :2-7 days 

B Singapore EMS :15-45 days 
C Singapore post air post :20-60 days
If your country need through other transportation to send the goods, Please contact us to help you solve the transportation problem.
According to the regulations of the Russian post office, all Russian buyers must provide full name was able to pick up package.
If you are Russian customers, please provide your full name, thank you for your cooperation.

2. About warranty And after-sale service 

We  will give our customer a best after-sale service , So we will offer one year warranty for most of our products and professional technical support .

If you have any question for your test ,please contact with us in any time!:)

3. Feature and advantages:

Best advantage is : we are factory ,so we have so many lenses withdifferent size and with low price ,what’s more ,we canmake mould by ourselves, so we can customize fresnel lens according to your design.
1) High light transmittance
2) Hihh efficiency in focusing
3) We can provide customer fresnel lens,because we can make mould by ourselves
4) 10 years professional induction and design
5) High quality and competitive price
6) Good after-sales service