Fresnel Lens for Shortest DIY Projector Focal Length 140mm India

The Fresnel lens reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. An ideal Fresnel lens would have infinitely many such sections. In each section, the overall thickness is decreased compared to an equivalent simple lens. This effectively divides the continuous surface of a standard lens into a set of surfaces of the same curvature, with step wise discontinuities between them.

In some lenses, the curved surfaces are replaced with flat surfaces, with different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion, with steeper prisms on the edges, and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism. 'Single-piece' Fresnel lenses were later produced, being used for automobile headlamps, brake, parking, and turn signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) might be used to manufacture more complex lenses.

Fresnel lens design allows a substantial reduction in thickness (and thus mass and volume of material), at the expense of reducing the imaging quality of the lens, which is why precise imaging applications such as photography still use conventional bulky lenses.

This is best fit for 8.9" and below LCDs, It has 3 mm holes at corners for proper fixing.

• Focal Length : 140 mm
• Size: 150X220 mm
• Thickness: 2mm
• Material: PMMA
• Groove Pitch: 0.3

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Package Contains

1 X Fresnel Lens F140 mm