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Bi-concave glass lenses are manufactured with both surfaces concave. 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.
  • Antireflection coatings can be ordered as an option.
  • We will provide precision grade bi-concave lenses with tighter manufacturing tolerances.
  • Minimum Order Quantity (MOQ) ranging from 100 to 1,000 units.

General Specifications:

Parameter Value
Default unit mm
Material BK7
Diameter tolerance +0, -0.1mm
Focal length tolerance +/-2%
Center thickness tolerance +/-0.2mm
Centration 3 arc min
Surface quality 60-40
Flange width 0.2-0.4mm

PN: DVS006-027
Description: Bi-concave lens BK7, standard grade, Dia=6, EFL=-27
Material: BK7
EFL: -27.5
Diameter: 6
Index: 1.5168
BFL: -28.15
Tc: 2
Te: 2.31
Radius1: -28.761
Radius2: 28.7607282098198
Volume Price: $11.20 (MOQ Range Applies) Request Volume Quote

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