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Biconvex lenses are one of the most simple lenses, but good quality, glass lenses with both faces convex and spherical.  Biconvex lenses are widely used for moderate quality imaging and also for focussing and control of laser beams. Generally biconvex lenses have both surfaces with the same curvature.

Knight Optical's stock range of quality grade N-BK7 or equivalent biconvex lenses are available uncoated or broadband AR coated for visible through to NIR applications. Knight optical also offers custom biconvex lenses to meet your requirements or alternatively edge stock lenses for a quick turnaround. We can supply alternative coatings where requested, including broadband 630-1100nm and 1050-1700nm anti reflective coatings for IR and telecoms applications.

Centring Accuracy:
Focal Length (@ 587nm):

Centre Thickness:
Edge Thickness:
Surface Quality:

N-BK7 or equivalent
+0.0 /-0.10mm
5 arcmin
± 0.2mm (< 10mm)
± 2.0% (10mm - 1000mm)
± 5.0% (> 1000mm)
± 0.2mm
± 0.2mm
<40-20 scratch/dig
Planoconvex lenses with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.5%@450-900nm (AV2 specification)

Stock lenses can be edged to smaller diameters.
Stock lenses can be ground to rectangular and square shaped apertures.
Shorter focal lengths in relation to the diameter available.
Mounting into lens cells.
Special anti-reflective coatings for broadband applications and wavelengths
Broadband Multilayer AR, R.avg<0.4%@1050-1700nm
Broadband Multilayer AR, R.avg<0.4%@630-1100nm

17 Items

Name Coating Focal Length (mm) Diameter (mm) Back Focal Length (mm) Centre Thickness (mm) Edge Thickness (mm) Material Price Buy
LBV0806 Uncoated 8.0 6.0 BK7 or equivalent
LBV1010 Uncoated 10.0 10.0 BK7 or equivalent
LBV1212 Uncoated 12.0 12.0 BK7 or equivalent
LBV1512 Uncoated 15.0 12.5 BK7 or equivalent
LBV2512 Uncoated 25.0 12.5 BK7 or equivalent
LBV2525 Uncoated 25.0 25.0 8.4 BK7 or equivalent
LBV3022 Uncoated 30 22.5 BK7 or equivalent
LBV4040 Uncoated 40.0 40.0 BK7 or equivalent
LBV4040-AV2 AR coated (R<0.5% 450-900nm) 40.0 40.0 BK7 or equivalent
LBV5012 Uncoated 50.0 12.5 BK7 or equivalent
LBV5025 Uncoated 50.0 25.0 BK7 or equivalent
LBV7512 Uncoated 75.0 12.5 BK7 or equivalent
LBV7525 Uncoated 75.0 25.0 BK7 or equivalent
LBV10012 Uncoated 100.0 12.5 BK7 or equivalent
LBV10025 Uncoated 100.0 25.0 BK7 or equivalent
LBC10038 Uncoated 100 38 BK7 or equivalent
LBV0111 Uncoated 125 111 115 30.7 4.7 BK7 or equivalent

17 Items


BK7 Biconvex Lenses

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Focal Length (mm)
Diameter (mm)
Centre Thickness (mm)