Fresnel lenses Fresnel lenses replace conventional lenses that have a curved surface with a series of concentric grooves, which are moulded into the surface of lightweight plastic sheets. The moulded grooves act as individual refracting surfaces when viewed in cross section. These lightweight large-aperture Fresnel lenses are widely used as collimators and collectors, e.g. in sensor or communication systems. Alongside our established low-cost standard range, we offer a precision range of different manufacture, with very close tolerances and better surface finish, and so suitable for more demanding applications such as projection systems and simulators. Some 'cylindrical' lenses focusing light in one direction only are included. These lenses are uncoated.
Knight Optical > Lenses > Fresnel lenses > Precision range (Cylindrical type) Only UK and EU customers are charged VAT at 17.5%, customers outside the EU and EU customers based outside the UK who have a valid EU VAT number will not be charged VAT Bulk Discounts! Where (B) appears next to a price below, bulk prices are available, click the (B) button to view! PDF Part No. Focal length (mm) Material Thickness (mm) Effective aperture (mm) Facet width (mm) Overall size (mm) Price Qty Buy LFY38203 38.1 Acrylic 2 203 x 38 0.25 250 x 50 £51.00 LFY150300 150 Acrylic 2 310 x 100 0.3 310 x 110 £100.70 Knight Optical > Lenses > Fresnel lenses > Precision range (Cylindrical type)
Specification   Material: Acrylic Material Data: (see materials section) Focal Length: Standard Range: ± 5% Precision Range: ± 1% Design condition: Parrallel light on grooved side
Specific requirements We can source Fresnel Lenses to most sizes or focal length at short notice, so if your requirements are not listed please contact us by telephone/ fax or email: stockrequirement@knightoptical.co.uk Options available   · Cutting to size   · Many other types available at short notice   · Stock lenses can be edged to smaller diameters See also Fresnel prisms and beam dividers