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Convex Spherical Lenses

Convex Spherical Lenses


BK7, FS, UVFS, CaF2, ZnSe, Si, Ge


3 – 200 mm

Surface quality, S-D

40-20, 20-10*

Surface irregularity, P-V

<λ/4 @ 632.8 nm*

Focal length tolerance


Centration error

<3 arcmin

AR coatings

On request

*depending on material and size

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Convex spherical lenses are used for focusing light and collimation. Plano-convex (PCX) lenses have one surface with a convex radius of curvature, while the other surface is plano. This is the most common type of convex spherical lenses. With double-convex (DCX) lenses, both surfaces have a convex radius, giving them a shorter focal length than PCX lenses of equal radius of curvature.

The most common materials used for convex spherical lenses are BK7 and UVFS. However, UVFS has various grades and a specific grade of glass should be chosen for specific applications. If you have doubts about which type of glass is best for your application, contact us for an advice you.

Convex spherical lenses are typically coated with e-beam technology so they can reach a reflectivity of R<0.2% per surface, but for more demanding applications sputtering technology is used to achieve a reflectivity of R<0.1%.


Contact us for help with your challenge. We have a team of experienced coating engineers and metrology capabilities to prototype and transfer your idea into a well-defined production process.

Typical Items for Convex Spherical Lenses
Material Diameter, mm EFL*, mm @ 632.8 nm Product ID
UVFS Ø12.7 +50 1-PCX-2-D127
UVFS Ø12.7 +75 1-PCX-2-F127
UVFS Ø12.7 +100 1-PCX-2-G127
UVFS Ø12.7 +150 1-PCX-2-H127
UVFS Ø25.4 +50 1-PCX-2-B254
UVFS Ø25.4 +75 1-PCX-2-D254
UVFS Ø25.4 +100 1-PCX-2-E254
UVFS Ø25.4 +125 1-PCX-2-F254
UVFS Ø25.4 +150 1-PCX-2-G254
UVFS Ø25.4 +200 1-PCX-2-H254
UVFS Ø25.4 +300 1-PCX-2-K254
UVFS Ø25.4 +500 1-PCX-2-M254
UVFS Ø25.4 +750 1-PCX-2-N254
UVFS Ø25.4 +1000 1-PCX-2-P254
UVFS Ø25.4 +1500 1-PCX-2-S254
UVFS Ø25.4 +2000 1-PCX-2-T254
UVFS Ø25.4 +4000 1-PCX-2-W254

* Effective focal length

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