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 > Biconvex lenses - Quality Grade > Uncoated 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 Diameter (mm) Back focal length (mm) Centre thickness (mm) Edge thickness (mm) Price Qty Buy LBV1010 10 BK7 10 8.5 4.3 1.5 £12.19 LBV1616 16 BK7 16 13.9 6 1.5 £14.95 LBV1212 12 BK7 12 13.9 6 1.5 £14.95 PDF Part No. Focal length (mm) Material Diameter (mm) Edge thickness (mm) Price Qty Buy LBV1613 12.7 BK7 16 1.5 £14.95 LBV2525 25 BK7 25 22.1 8.4 1.5 £17.99 LBV3225 31.5 BK7 25 29.2 6.7 1.5 £17.99 LBV4025 40 BK7 25 38.1 5.5 1.5 £17.99 LBV4040 40 BK7 40 35.6 12.5 1.5 £20.45 LBV90100 90 BK7 100 1.5 £99.95 Knight Optical > Lenses > Biconvex lenses - Quality Grade > Uncoated
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