Crown-glass meniscus lenses Meniscus lenses have one face curved inwards and the other curved outwards. Ophthalmic meniscus lenses offer a wide range of powers at low cost. The crown-glass meniscus 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 > Crown-glass meniscus 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 > Crown-glass meniscus lenses
Specification   Material: B270 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 Crown-glass Meniscus 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 Crown-glass meniscus lenses are uncoated, however a coating can be applied at short notice (see coatings section) Options available   · Mounting (25mm dia only)   · AR Coating   · Stock lenses can be edged to smaller diameters See also High Index Meniscus Lenses: Meniscus laser lenses Negative Meniscus Lenses: Meniscus negative lenses Cylindrical Meniscus Lenses: Meniscus cylindrical lenses