Symmrtric-concave Spherical Lenses - Lenses - BTMT | Beijing Trans Manufacture and Trade Co., Ltd.

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Symmrtric-concave Spherical Lenses

Symmetric concave lenses are manufactured with both concave surfaces. They have negative focal lengths. These lenses are often used to expand light or to increase focal lengths in existing systems. Also, they can be used in laser beam expander, optical characterreaders, viewers, and projection systems..

Specifications

Material
Crown, Flint, UVFS
Focal Length Tolerance
± 0.5%
Diameter Tolerance
+0/-0.2mm
Thickness Tolerance
± 0.2mm
Surface Flatness
λ/10
Centration Error
<3 arcmin
Surface Quality
20/10
Clear Aperture
>90% of central diameter
Coating
According to the requirements

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