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.
  •  Plano-convex lens has a positive focal length, which makes it ideal for collecting and focusing
     light for many imaging applications..
  • Plano-concave lens has a negative focal length and is used for image reductinon or to spread light.
  • 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.
  • 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.
  • Meniscus lense has a positive or negative focal length, it forms a real or virtual image of objects.



Attribute Specification
Material BK7, K9, Fused Silica, SF10, Silicon, CaF2, Sapphire etc.
Typical Diameter (Фmm) 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.
Diameter Tolerance (mm) +0.0/-0.2 (General), +0.0/-0.02 (High Precision)
Paraxial Focal Length Tolerance (mm) ±2%
Centration <3 arc min
Clear Aperture >80% (Small Size), >95% (Large Size)
Surface Figure (per 25mm@632.8nm) <1.5λ, (General), <λ/4 (High Precision)
IRR ( @632.8nm) <λ/4 (General), <λ/10 (High Precision)
Surface Quality 60/40 (General), 10/5 (High Precision)
Bevel (face width x 450) <0.25mm
Coating uncoated, AR, HR, PR Coating, etc.
Note for Spheric Lens:
1). Other optical glass materials from Schott or Chinese CDGM are also available upon request.
2). Custom-made Spheric Lenses at any size from dlameter 2.0mm to 300mm are available upon request.
(3). Typical paraxial focal length tolerance is +2%, better tolerance is available upon request
(4). Typical centration is 3 arc minutes, better precision is avallable upon request
(5). Besides uncoated, Lenses with Anti-Reflective(AR), High-Retflective(HR), Partial-Reflective(PR) coating

are available upon request, Please refer to Part 5 OPTICAL COATING for more information about coating.

Mass Production: 1 Million Pieces Per Month

Medium/Small Batch Production: 100K Pieces Per Month

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