Meniscus negative lenses Ophthalmic meniscus lenses offer a wide range of powers at low cost. These meniscus negative lenses are useful as a supplementary lens for reducing the power of another lens. Meniscus negative lenses are stocked in standard 60mm diameter with a moulded edge and in 25mm diameter, which has an edged, finish and are centred.
Knight Optical > Lenses > Meniscus negative lenses 25 diameter (mm) This is the section containing 25 diameter (mm). 60 diameter (mm) This is the section containing 60 diameter (mm). 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 > Meniscus negative lenses
Specification   Material: B270 SF11 for lower spherical aberrations (See spherical aberration calculation section)  Material Data: (see materials section)  Diameter: +0.0 / -0.125 (25mm dia) ± 1mm (60mm dia)  Back vortex power: (=1/back F.L) ± 0.06D ( 4D) ± 0.12D (> 40D)  Surface Quality: <60-40 scratch/dig (see quality section)
Specific requirements We can manufacture Meniscus Negative Lenses to any 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 Meniscus Negative Lenses are uncoated, however a coating can be applied at short notice (see coatings section) Options available   · Mounting (25mm only)   · AR coating   · Stock lenses can be edged to smaller diameters See also Positive meniscus lenses: Meniscus laser lenses & Crown-glass meniscus lenses Cylindrical meniscus lenses: Meniscus cylindrical lenses