Our 430-700 nm N-BK7 precision bi-convex (double-convex) lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion for demanding laser focusing applications.
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KBX010AR.14 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 6.4 mm EFL, 430-700nm |
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$58 |
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KBX013AR.14 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 12.7 mm EFL, 430-700nm |
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$51 |
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KBX019AR.14 Bi-Convex Lens, N-BK7, 6.35 mm Diameter, 25.4 mm EFL, 430-700nm |
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$51 |
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KBX022AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 12.7 mm EFL, 430-700nm |
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$51 |
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KBX025AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 19.0 mm EFL, 430-700nm |
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$51 |
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KBX028AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 25.4 mm EFL, 430-700nm |
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$51 |
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KBX031AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 38.1 mm EFL, 430-700nm |
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$51 |
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KBX034AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 50.2 mm EFL, 430-700nm |
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$51 |
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KBX037AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 62.9 mm EFL, 430-700nm |
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$51 |
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KBX040AR.14 Bi-Convex Lens, N-BK7, 12.7 mm Diameter, 75.6 mm EFL, 430-700nm |
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$51 |
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KBX043AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 19.0 mm EFL, 430-700nm |
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$55 |
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KBX046AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 25.4 mm EFL, 430-700nm |
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$55 |
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KBX049AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 38.1 mm EFL, 430-700nm |
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$55 |
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KBX052AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 50.2 mm EFL, 430-700nm |
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$55 |
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KBX055AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 62.9 mm EFL, 430-700nm |
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$55 |
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KBX058AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 75.6 mm EFL, 430-700nm |
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$55 |
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KBX061AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 88.3 mm EFL, 430-700nm |
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$55 |
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KBX064AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 100 mm EFL, 430-700nm |
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$55 |
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KBX067AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 125 mm EFL, 430-700nm |
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$55 |
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KBX070AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 150 mm EFL, 430-700nm |
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$55 |
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KBX073AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 175 mm EFL, 430-700nm |
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$55 |
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KBX076AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 200 mm EFL, 430-700nm |
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$55 |
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KBX079AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 250 mm EFL, 430-700nm |
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$55 |
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KBX082AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 500 mm EFL, 430-700nm |
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$55 |
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KBX088AR.14 Bi-Convex Lens, N-BK7, 25.4 mm Diameter, 1000 mm EFL, 430-700nm |
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$55 |
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KBX139AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 38.1 mm EFL, 430-700nm |
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$78 |
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KBX142AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 50.2 mm EFL, 430-700nm |
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$78 |
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KBX145AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 62.9 mm EFL, 430-700nm |
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$78 |
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KBX148AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 75.6 mm EFL, 430-700nm |
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$78 |
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KBX151AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 88.3 mm EFL, 430-700nm |
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$78 |
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KBX154AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 100 mm EFL, 430-700nm |
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$78 |
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KBX157AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 125 mm EFL, 430-700nm |
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$78 |
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KBX160AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 150 mm EFL, 430-700nm |
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$78 |
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KBX163AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 175 mm EFL, 430-700nm | $78 |
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KBX166AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 200 mm EFL, 430-700nm |
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$78 |
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KBX169AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 250 mm EFL, 430-700nm |
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$78 |
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KBX172AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 300 mm EFL, 430-700nm |
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$78 |
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KBX175AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 400 mm EFL, 430-700nm |
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$78 |
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KBX178AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 500 mm EFL, 430-700nm |
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$78 |
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KBX184AR.14 Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 1000 mm EFL, 430-700nm |
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$78 |
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N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics. N-BK7 is also relatively hard and shows good scratch resistance. The transmission range for BK 7 is 380 to 2100 nm. It is not recommended for temperature sensitive applications, such as precision mirrors. For more information, refer to our optical materials technical note.
Our precision bi-convex lenses are polished to tight tolerances minimizing wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. These lenses have a 40-20 scratch-dig surface quality, and a λ/4 surface irregularity. For more information, refer to the optical surfaces technical note.
Our AR.14 broadband multilayer antireflection coating markedly improves the transmission efficiency of these lenses by reducing surface reflections over a 430-700 nm wavelength range. This visible AR coating performs effectively for multiple visible wavelengths and tunable lasers eliminating the need for several sets of optics.
Standard effective focal lengths on our double-convex lenses provide a systematic approach allowing for lenses of different sizes and materials to be interchanged without requiring other changes to your optical system.
Bi-Convex lenses are the best choice when the object and image are at equal or near equal distance from the lens. When the object and image distance are equal (1:1 magnification), not only is spherical aberration minimized, but also coma, distortion, and chromatic aberration are identically canceled due to the symmetry. Bi-convex lenses function similarly to plano-convex lenses in that they have a positive focal length, and focus parallel rays of light to a point. Both surface are spherical and have the same radius of curvature, thereby minimizing spherical aberration. As a guideline, bi-convex lenses perform within minimum aberration at conjugate ratios between 5:1 and 1:5. Outside this magnification range, plano-convex lenses are usually more suitable.
We offer a full range of optical lens mounts to meet various experimental requirements. Below lists the recommended mounts for spherical lenses of standard sizes. Please see our Lens Mount Guide for additional information.
Note: besides the diameter, please check the Edge Thickness (Te) specification of the lens and the lens mount to ensure compatibility before purchasing.
| Lens Diameter |  A-Line™ Lens Mounts |
 LT Series Lens Tubes |
 LP Series Lens Positioners |
 Optics Cage Plus Series |
|---|---|---|---|---|
| 76.2 mm | ( |
N/A | N/A | N/A |
| 50.8 mm | ( |
N/A | ||
| 38.1 mm | ( |
LT20 lens tube with |
LP-2 lens positioner with |
N/A |
| 25.4 mm | ( |
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| 12.7 mm | ( |
N/A | ||
| 6.35 mm | LT05 lens tube with |
LP-05 lens positioner with |
N/A |
For non-standard sizes not listed above, check out our variable size lens mounts.
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