FOCTek Photonics
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Frequently Asked Questions

FOCtek provides five kinds of spheric lens forms, or shapes, that determine the imaging characteristics of the lenses. They are plano-convex, plano-concave, double-convex, double-concave, and meniscus.

A plano-convex lens has a positive focal length, which makes it ideal for collecting and focusing light for many imaging applications.

A double-convex lens has a positive focal length and is useful for 1:1 imaging and in multielement systems, also known as biconvex or equiconvex. A double-concave lens has a negative focal length and is useful for 1:1 imaging and in multielement systems, also known as biconcave or equiconcave.

FOCtek's spheric lenses come in typical diameters of 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.

Yes, custom-made spheric lenses at any size from diameter 2.0mm to 300mm are available upon request.

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