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Bi-convex lenses are manufactured with an identical convex surface on both sides of the lens.

  • Bi-convex lenses have positive focal lengths and form both real and virtual images.
  • Aberrations such as coma, distortion, and chromatic aberration almost exactly cancel out at unit conjugate ratios due to the symmetry. Aberrations will increase as conjugate ratios depart from unity.
  • Recommended for virtual imaging of real objects, and for positive conjugate ratios from approximately 0.2 to 5. Values are wavelength sensitive.
  • Antireflection coatings can be ordered as an option.
  • Bi-convex elements have a 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
Clear aperture 90%
Focal length tolerance +/-1%
Center thickness tolerance +/-0.2mm
Centration 3 arc min
Surface quality 20-10

PN: DXP027
Description: Bi-convex lens precision grade BK7 D= 21.0 EFL= 20.0
Material: BK7
EFL: 20
Diameter: 21
Index: 1.51872
BFL: 17.09
Tc: 8.2
Te: 1.96
Radius1: 19.239
Radius2: -19.2385087095678
Volume Price: Request Volume Quote

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