Meniscus Lens
BRD Optical provides meniscus lens in both positive and negative focal lengths. These lenses are useful when uses of positive meniscus lens with another lenses to increase or decrease the focal length. This lens element configuration does not introduce any additional coma or spherical aberrations Description Of Positive/Negative Meniscus Lens BRD Optical provides meniscus lens in both positive and negative focal lengths. On the aspect of shape, it can be divided into convex and concave meniscus lens. On the aspect of the effect, it can be divided into diverging and converging meniscus lens. Specifications Of Positive/Negative Meniscus Lens Material Optical glass/ Fused silica/ sapphire etc. Diameter 2mm~300mm Diameter tolerance ±0.05mm(≤50mm) ±0.1mm( ＞ 50mm) Focal length -50mm~-2000mm Focal length tolerance ±0.2% （＜ 10mm ） ±0.5% （＜ 10mm-1000mm ） ±1% （＜＞ 1000mm ） Center Thickness 2mm~20mm Surface quality 60/40 ， 40/20 ，...