2Pcs 50mm80mm Fresnel Lens For Google Cardboard 3D Virtual Reality VR

About Fresnel lens:
-FRESNEL LENS works well with wide angle lens which tends to give dark corners.
-Class leading brightness and contrast comparing to
-Provision of critical focus reference point for utmost accuracy
-Thinnest profile in the market with minimized focus shift
-This can really be a great and creative gift to children as a toy and senior people who need visual aid.

Application:
Fresnel are most often used in light gathering applications, such as condenser systems or emitter/detector setups.
It can also be used as magnifiers,3D display or projection .
This Lens is also great for the fine print in books, magazines , maps, telephone directories, recipes, etc.

Specification:
Material: PVC（ casting）
: Transparent
Shape: Flat
Lens Diameter:50mm
Focal Length:80mm
Thickness:1mm

Please notice:
All the have injection port at the edge ,it look like crash trace,actually not,just designed for this.









a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a