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Knight Optical(UK) Ltd - - +44 (0)1622 859444

BK7 biconvex lenses

What are you looking for in Stock?

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.

Please note we also stock a full range of UV grade fused silica convex lenses uncoated or AR coated for ultra-violet applications.

Material: N-BK7 or equivalent
Diameter: +0.0 / -0.10mm ( ≤ 65mm) +0.0 / -0.15mm ( > 65mm)
Centring accuracy: 5 arcmin
Focal length (@ 587nm): ± 0.2mm (< 10mm) ± 2.0% (10mm - 1000mm) ± 5.0% (> 1000mm)
Centre thickness:
Edge thickness:
Lenses to 2.5mm dia
Lenses to 4.0mm dia
Lenses to ≥6.5mm dia
± 0.2mm

Surface quality: <40-20 scratch/dig
Coating: Planoconvex lenses with suffix "AV2" are coated on both faces with:
Extended broadband multilayer antireflective coating <0.5%@450-900nm (AV2 specification)


Stock Optics

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Part No. CoatingFocal length
Back FL
Edge thick
Material Price
LBV0806 Uncoated8.06.0BK7 or equivalent £13.95
LBV0806-AV2 AR coated (R<0.5% 450-900nm)8.06.0BK7 or equivalent £22.95
LBV10025 Uncoated100.025.0BK7 or equivilent £15.95
LBV1010 Uncoated10.010.0BK7 or equivalent £13.95
LBV1212 Uncoated12.012.0BK7 or equivalent £13.95
LBV2525 Uncoated25.025.0BK7 or equivilent £15.95
LBV4040 Uncoated40.040.0BK7 or equivalent £18.95
LBV4040-AV2 AR coated (R<0.5% 450-900nm)40.040.0BK7 or equivalent £24.45
LBV5025 Uncoated50.025.0BK7 or equivilent £15.95
LBV10012 Uncoated100.012.5BK7 or equivalent £13.95
LBV1512 Uncoated15.012.5BK7 or equivalent £13.95
LBV7525 Uncoated75.025.0BK7 or equivalent £15.95
LBV2512 Uncoated25.012.5BK7 or equivalent £13.95
LBV5012 Uncoated50.012.5BK7 or equivalent £13.95
LBV7512 Uncoated75.012.5BK7 or equivalent £13.95
LBV0111 Uncoated12511111530.74.7 £47.50
LBV3022 Uncoated3022.5BK7 £15.95

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Get in touch

Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
+1 401 583 7846

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