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 > Standard range 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 diameter (mm) Overall size (mm) Price Qty Buy LFG0505 5 Acrylic 1.5 5 15 x 15 £8.25 LFG1013 10 Acrylic 1.5 13 26 x 26 £7.65 LFG1525 15 Acrylic 1.5 25 39 x 39 £7.65 LFG2233 22 Acrylic 1.5 33 51 x 51 £7.65 LFG2525 25 Acrylic 1.5 25 38 x 38 £7.65 LFG3250 32 Acrylic 1.5 50 58 x 58 £8.25 LFG3850 38 Acrylic 1.5 50 58 x 58 £8.25 LFG5050 50 Acrylic 1.5 50 64 x 64 £8.25 LFG6163 61 Acrylic 1.5 63 76 x 76 £17.85 LFG70102 70 Acrylic 1.5 102 127 x 127 £18.55 LFG8063 80 Acrylic 1.5 63 76 x 76 £19.25 LFG76152 76 Acrylic 1.5 152 170 x 170 £41.60 LFG10063 100 Acrylic 1.5 63 76 x 76 £10.50 LFG127102 127 Acrylic 1.5 102 127 x 127 £29.70 LFG152152 152 Acrylic 1.5 152 170 x 170 £38.55 LFG254152 254 Acrylic 1.5 152 170 x 170 £40.95 LFY15276 152 Acrylic 1.5 76x76 (Cylindrical type lens) 76 x 76 £14.95 Knight Optical > Lenses > Fresnel lenses > Standard range
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