Quality Biconvex lenses Biconvex lenses are used for shorter focal lengths in comparison to a larger diameter required, and used for focusing parallel rays of light to a point, and would be best used for high quality imaging and laser applications. These biconvex lenses are from BK7 and SF11 and are ideal for most high quality imaging and laser applications. These biconvex lenses are stocked uncoated or with a broadband AR coating for 450-900nm.
Knight Optical > Lenses > Quality biconvex lenses Uncoated This is the section containing Uncoated. AR coated 450-900nm This is the section containing AR coated 450-900nm. 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 Knight Optical > Lenses > Quality biconvex lenses
Specification   Material: BK7, SF11 Material Data: (see materials section) Diameter: +0.0 / -0.10mm ( 63mm) +0.0 / -0.15mm ( > 63mm) Centring Accuracy: < 0.1mm (F.L 40mm) < 2.5mrad (F.L > 40mm) Focal Length (@ 587nm): ± 0.2mm (< 10mm) ± 2.0% (10mm - 1000mm) ± 5.0% (> 1000mm)   Centre Thickness: ± 0.35mm   Surface Quality: <40-20 scratch/dig (see quality section)
Specific requirements We can manufacture Biconvex Lenses to any size 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 Coating Biconvex lenses with suffix "AV2" are coated on both faces with (Extended brad band multilayer antireflective coating < 0.5% @ 450-900nm (see coatings section) Options available   · For shorter focal lengths in relation to your required diameter please see section biconvex   · Stock lenses can be edged to smaller diameters   · Mounting (lenses up to 50mm dia)   · Special AR coating (see coatings section) See also Higher Quality: High-index planoconvex laser lenses & Precision aspheric lenses Larger sizes: Fire-polished biconvex lenses & Commercial achromatic doublets UV Lenses: UV-silica convex lenses Short FL and larger relative aperture: UV-silica convex lenses, Precision aspheric lenses & Commercial achromatic doublets Lower-cost lenses: Commercial convex lenses & Fire-polished biconvex lenses