Positive Meniscus Lenses And Negative Meniscus Lenses

The Positive Meniscus Lenses are a convex-concave lens, but it is thicker at the center than at the edges. They are felt polished and are used universally in the ophthalmic industry where convention dictates that lens power be specified in Diopters.

The Negative Meniscus Lenses are a convex-concave lens, but it is thinner at the center than at the edges. Otherwise description is similar to Plano Concave lenses.

1. What's the advantages of using Meniscus Lenses?

It produce a smaller focal point and fewer aberrations than a standard plano-convex lens and enhance image quality.


2. What is Meniscus Lens?

Meniscus lenses have two curved surfaces,convex on one side and concave on the other side. It is thicker at the center than at the edges. When a meniscus lens is combined with another lens, the focal length is shortened and the numerical aperture of the system is increased.


3. What's the applications of Meniscus Lens?

Negative meniscus lenses are often used for Infrared Application. These lenses are used as an alternative to other negative lenses with a greater curvature on the concave side and a smaller curvature on the convex side. 

Meniscus Lenses Meniscus Lenses

Meniscus Lens Capabilities

Grade A optical glass or Fused Silica
Dimension Tolerance:
±0.1mm(Standard), ±0.05mm(High Precision)
Center Thickness Tolerance:
±0.1mm(Standard), ±0.05mm(High Precision)
Focal Length:
Surface quality:
60/40(Standard), 20/10(High Precision)
Clear Aperture:
Surface Figure:
λ/2(Standard), λ/4(High Precision) @633nm
3 arc minutes
Upon requirement

Meniscus lenses are widely used in projection systems, imaging systems, and laser measurement systems. Positive meniscus lenses are usually paired with lenses with a positive focal length for better focusing, and positive meniscus lens uses a wide range.

Part No. Material F(mm) Φ(mm) R1(mm) R2(mm) Tc(mm) Te(mm) Fb(mm)
ULMN100254 BK7 100 25.4 33.72 90 4 2.5 97.5
ULMN125254 BK7 125 25.4 38.47 90 4 2.8 121.8
ULMN150254 BK7 150 25.4 42.52 90 4 3 146.3
ULMN175254 BK7 175 25.4 46.05 90 4 3.1 171.2
ULMN200254 BK7 200 25.4 49.03 90 3.5 2.8 197
ULMN250254 BK7 250 25.4 83.96 235 3.5 2.9 246.5
ULMN300254 BK7 300 25.4 94.08 235 3.5 3 296.3
ULMN500254 BK7 500 25.4 123.9 235 3.5 3.2 495.4
ULMN100254N BK7 -100 25.4 90 32.59 3 4.5 -99.2
ULMN125254N BK7 -125 25.4 90 37.26 3 4.2 -123.7
ULMN150254N BK7 -150 25.4 90 41.42 3 4 -149.5
ULMN175254N BK7 -175 25.4 90 44.86 3 3.8 -174.6
ULMN200254N BK7 -200 25.4 90 47.84 3 3.7 -199.6
ULMN300254N BK7 -300 25.4 235 93.13 3 3.5 -298.3
ULMN500254N BK7 -500 25.4 235 122.6 3 3.3 -496.5
ULMN600254N BK7 -600 25.4 600 204.08 3 3.2 -596.8


    Generally speaking, there are two types of spherical lenses. Therefore, a lens formed by combining two spherical surfaces that protrude outwards is called a convex lens, and a lens formed by combining two spherical surfaces into an inwardly curved lens is called a concave lens, which is the convex and concave lens.

   Bi-concave glass lenses are manufactured with both surfaces concave like- glass concave lens. These lenses have negative focal lengths. These lenses diverge collimated incident light and form virtual images, which are seen through the lens. They are often used to expand light or increase focal lengths in existing systems. They are used in laser beam expanders, optical character readers, viewers, and projection systems. Anti reflection coatings can be ordered as an option.

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