Concave Lenses

Plano-concave lenses have a plano flat face and an inward facing concave face. Biconcave lenses have both faces with inwards facing curves. They have a negative focal length achieved by bending input parallel rays so that they diverge away from one another on the output side of the lens. Plano-convex lenses are mainly used for image reduction in beam expanders, tube-length correction lens in microscopy and as a Barlow lens in astronomy. Our surplus concave lenses are mainly listed in BK7 or F2 equivalent materials. High-index materials such as F2 reduce spherical aberration and offers low F numbers. We also list lenses manufactured from UV Grade Fused Silica which works at 175nm.

Specification:
Diameter:	+0/-0.15mm
Centration:	<6 arc minutes
:Focal length:	1-1.5%
Centre thickness:	+/-0.15mm
Surface quality:	60-40 scratch/ dig

If you require concave lenses up to 18” dia, AR coated for visible, NIR or Telecoms wavelengths.
Telephone +1-401 583 7846 or email sales@surplus-optics.com
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