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N-BK7 Plano-Convex Lenses (Uncoated)


  • Positive Focal Length and Near Best Form for Infinite Conjugate Applications
  • Complete Thorlabs Lens Catalog Available in Zemax

LA1470

(Ø6 mm)

LA1576

(Ø9 mm)

LA1540

(Ø1/2")

LA1859

(Ø18 mm)

LA1229

(Ø1")

LA1417

(Ø2")

LA1238

(Ø75 mm)

Related Items


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Common Specifications
Lens Shape Plano-Convex
Substrate Material N-BK7 (Grade A)a
Wavelength Range 350 nm - 2.0 μm (Uncoated)
Diameters Available Ø6 mm, Ø9 mm, Ø1/2", Ø18 mm,
Ø25 mm, Ø1", Ø30 mm, Ø2", or Ø75 mm
Diameter Tolerance +0.00/-0.10 mm
Design Wavelength 587.6 nm 
Index of Refraction
@633 nm
1.515
Surface Quality 40-20 Scratch-Dig
Surface Flatness
(Plano Side)
λ/2
Spherical Surface Powerb
(Convex Side)
3λ/2
Surface Irregularity
(Peak to Valley)
λ/4
Abbe Number vd = 64.17
Centration ≤3 arcmin
Clear Aperture >90% of Diameter
Focal Length Tolerance ±1%
  • Click Link for Detailed Specifications on the Substrate
  • Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.
Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

Features

  • Material: N-BK7
  • Wavelength Range: 350 nm - 2.0 μm (Uncoated)
  • Available Uncoated or With One of Three Broadband Antireflection Coating
  • Offers Excellent Transmittance Throughout the Visible and Near Infrared
  • Focal Lengths Available from 10 to 1000 mm

These uncoated Plano-Convex Lenses are fabricated from RoHS-compliant BK7 glass (N-BK7). N-BK7 is probably the most common optical glass used for high quality optical components. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.

Optic Cleaning Tutorial

Like all plano-convex lenses, these lenses have a positive focal length and near-best-form shape for infinite and finite conjugate applications. They can be employed to converge collimated beams or collimate light from a point source. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.

The focal length of each lens can be calculated using a simplified thick lens equation:

f= R/(n-1),

where n is the index of refraction and R is the radius of curvature of the lens surface. These lenses are fabricated from N-BK7, which has an Abbe Number of 64.17.

Although uncoated lenses are highlighted on this page, these N-BK7 Plano-Convex lenses are also available with one of three Antireflection Coatings (-A, -B, -C, or -D), which can reduce the amount of light reflected from each surface of the lens. Links to each of these pages can be found in the table above. Please see the Graphs tab for coating information.

Thorlabs offers fixed lens mounts that can be used for mounting the lenses sold here. For mounting high-curvature lenses in select sizes, extra-thick retaining rings with SM05 (0.535"-40), SM1 (1.035"-40), or SM2 (2.035"-40) threading are available that provide extra clearance for spanner wrenches (see the Lens Mounting Guide tab for more information).

N-BK7 lens kits are also available. Please click here for information.

N-BK7 Plano-Convex Lens Selection Guide
Unmounted Lenses Mounted Lenses
Uncoated Uncoated
A Coating (350 - 700 nm) A Coating (350 - 700 nm)
B Coating (650 - 1050 nm) B Coating (650 - 1050 nm)
C Coating (1050 - 1700 nm) C Coating (1050 - 1620 nm)
D Coating (1650 - 3000 nm) -

Custom Coatings are also available. Please contact our technical support staff for a quote.

Optical Coatings and Substrates
Lens Tutorial
Quick Links to Other Spherical Singlets
Plano-Convex Bi-Convex Best Form Plano-Concave Bi-Concave Positive Meniscus Negative Meniscus

Below is the transmission curve for N-BK7, a RoHS-compliant form of BK7. Total Transmission is shown for a 10 mm thick, uncoated sample and includes surface reflections. Each of these unmounted N-BK7 plano-convex lenses can be ordered uncoated or with one of the following broadband AR coatings: 350 - 700 nm (Designated with -A), 650 - 1050 nm (Designated as -B), or 1050 - 1700 nm (Designated as -C).

These high-performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges. These coatings provide good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). For optics intended to be used at large incident angles, consider using a custom coating optimized at a 45° angle of incidence; this custom coating is effective from 25° to 52°. The plot shown below indicates the performance of the standard coatings in this family as a function of wavelength. Broadband coatings have a typical absorption of 0.25%, which is not shown in the reflectivity plots.

N-BK7 Transmittance
Click to Enlarge

Click Here for Raw Data

N-BK7 AR Coating Curves

Key Quality Control Equipment
  • TriOptics OptiSpheric
  • Zygo GPI-XP/D Interferometer
  • PerkinElmer Lambda 1050 Spectrophotometer
  • Agilent Cary 5000 Spectrophotometer
Click to Enlarge
A Thorlabs technician measuring the irregularity of one of our singlets using a Zygo GPI-XP/D Interferometer.

Introduction
Thorlabs has a series of quality control procedures in order to ensure our singlets meet our standards and specifications. This starts with in-process inspections of the lens’ imaging capabilities and ends with a final inspection of surface quality and dimensions. Specifications for particular products can be found in their linked documentation by clicking the  symbol. This tab will take you through the general process used to check for quality.

Singlet Quality Practices
In-process inspection begins once the singlet has been shaped to specifications. Focal length, surface irregularity, and surface power are checked, following sampling plan Level VI given in MIL-PRF-13830B (see below). These three specifications are imperative for proper imaging. Surface irregularity of parts is kept to below either a quarter wavelength or a half wavelength at 633 nm, depending on the material of the singlet. Below is a graph of over 200 batches of singlets with irregularity data of both their front and back sides.

At this point, some uncoated singlets will proceed to final inspection, while others will receive an antireflective (AR) coating. The application of optical coatings has its own in-process inspections. To ensure the AR coating is applied properly, we verify both reflectance and transmission performance by scanning witness pieces using spectrophotometry; the material of these 2 mm thick witness samples matches the other parts in the run. For reflectance verification, we use at least one witness sample for each coating run. Transmitting optics receive two AR coatings, one on each surface, so for the verification of transmission, we use one witness sample that is also coated on both of its sides. Large runs use multiple witness samples to ensure the uniformity across the deposition chamber. By testing coating performance during every run, variance over time is kept low. To see how coatings vary, see the table below.

Final inspection of both uncoated and AR-coated singlets includes a batch check of diameter and thickness and a 100% visual check to ensure that the surface quality, chamfer, and clear aperture meet our published specifications. While surface quality is cosmetic to a degree, scratches, digs, and other inclusions in the surface of a part can increase the chances of damage to the singlet when used with high-power sources. These inspections are done in a clean, dark room under lighting that meets the requirements of MIL-PRF-13830B. Inspection under a single light source in a dark room allows for inconsistencies in the glass to be located without being obscured by glare or reflections.

MIL-PRF-13830B: Performance Specifications for Optical Components
MIL-PRF-13830B is a document created by the U.S. Army Armament Research, Development and Engineering Center's Defense Quality and Standardization Office for the specifications covering how finished optical components should be manufactured, assembled, and inspected. While primarily for use in letting the military dictate how products they use can be incorporated into their equipment, these standards have been adopted by many optics manufacturers. To download a copy of the full document, click here.

-A Coating
350 nm to 700 nm
-B Coating
650 nm to 1050 nm
-C Coating
1050 nm to 1700 nm
Singlet
Irregularity
Coating Variance:
Transmission

Click to Enlarge

Click to Enlarge

Click to Enlarge

Click to Enlarge
Coating Variance:
Reflectance

Click to Enlarge

Click to Enlarge

Click to Enlarge

Disclaimer: The coated transmission data presented here are of 2 mm thick witness samples of N-BK7 or equivalent glass, and all the data here are typical. Some variations in performance data will occur from lot to lot. Please contact Technical Support with any questions regarding the use or reliability of these data.

BK7 Index of Refraction
Click here for raw data.
In the thick lens equation, use the index of refraction for N-BK7 at the wavelength of interest to approximate the wavelength-dependent focal length of any of the plano-convex lenses.

The focal length of a thick spherical lens can be calculated using the thick lens equation below. In this expression, nl is the index of refraction of the lens, R1 and R2 are the radii of curvature for surfaces 1 and 2, respectively, and d is the center thickness of the lens.

thick lens equation

When using the thick lens equation to calculate the focal length of a plano-convex lens, R1=∞ and R2=-R. Note that the minus sign in front of R is due to the sign convention used when deriving the thick lens equations and values of R are reported in the Specs tab as well as on the mechanical drawing for each lens. Therefore, via substitution, the thick lens equation becomes

simple thick lens equation

The focal length of the lens calculated using the simplified thick lens equation directly above is the distance between the second (back) principle plane (H") and the position at which a collimated beam incident on the curved surface of the plano-convex is focused. The principle plane positions of a thick lens can be calculated with the following equations:

principal plane equation one and Principal plane equation two

However, as with the thick lens equation, H' simplifies to zero and H" simplifies to

Principal plane two simple

when used to calculate the principal plane locations of plano-convex lenses. fb is the back focal length of the lens, which is often referred to as the working distance of the lens.

CXY1 in 30 mm Cage System
Click to Enlarge

CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System
Threaded Mounting Adapter
Click to Enlarge

Ø1" Optic Mounted in a
ST1XY-S XY Translator

Click to Enlarge

LMR1 Fixed Mount with Ø1" Lens

Click to Enlarge

LM2XY Translating Mount with Ø2" Lens
Recommended Mounting Options for Thorlabs Lenses
Item # Mounts for Ø5 mm to Ø10 mm Optics
Imperial Metric
(Various) Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm
(Various) Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø5 mm to Ø10 mm
Item # Mounts for Ø1/2" (Ø12.7 mm) Optics
Imperial Metric
LMR05 LMR05/M Fixed Lens Mount for Ø1/2" Optics
LM05XY LM05XY/M Translating Lens Mount for Ø1/2" Optics
SCP05 16 mm Cage System, XY Translation Mount for Ø1/2" Optics
(Various) Ø1/2" Lens Tubes,
Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø1" (Ø25.4 mm) Optics
Imperial Metric
LMR1 LMR1/M Fixed Lens Mount for Ø1" Optics
LM1XY LM1XY/M Translating Lens Mount for Ø1" Optics
ST1XY-S ST1XY-S/M Translating Lens Mount with Micrometer Drives (Other Drives Available)
CXY1 30 mm Cage System, XY Translation Mount for Ø1" Optics
(Various) Ø1" Lens Tubes,
Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Mounts for Ø2" (Ø50.8 mm) Optics
Imperial Metric
LMR2 LMR2/M Fixed Lens Mount for Ø2" Optics
LM2XY LM2XY/M Translating Lens Mount for Ø2" Optics
CXY2 60 mm Cage System, XY Translation Mount for Ø2" Optics
(Various) Ø2" Lens Tubes,
Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below)
Item # Adjustable Optic Mounts
Imperial Metric
LH1 LH1/M Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics
LH2 LH2/M Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics
VG100 VG100/M Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics
SCL03 SCL03/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics
SCL04 SCL04/M Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics
LH160C LH160C/M Adjustable Mount for 60 mm Cage Systems,
Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics
SCL60C SCL60C/M Self-Centering Mount for 60 mm Cage Systems,
Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics

 

Mounting High-Curvature Optics

Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.

Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.


Posted Comments:
user  (posted 2017-03-15 16:29:36.98)
Would be great if all lenses/optics came with a sheet of several stick on labels with the product number, and relevant specs, like focal length, coating etc. Usually the first thing I (and many other people) do when taking an optic out of the box is to mount it and then make a label for it.
tfrisch  (posted 2017-03-23 10:17:29.0)
Hello, thank you for contacting Thorlabs. I have posted this idea in our internal engineering forum. I agree that this could be useful.
wilsen4verminator  (posted 2015-06-28 12:55:09.56)
hi, i would like to know which lens has the dioptre value of 0.0- 1.0, and are this lens suitable for underwater use such as underwater welding ,thank you
besembeson  (posted 2015-07-22 07:09:18.0)
Response from Bweh at Thorlabs USA: You can calculate the lens power (in diopter) by taking the inverse of the focal length (1/f). Note that the focal length values we specify are in air, which will be different when the lens is used under water.
mchen  (posted 2014-03-11 15:20:15.06)
Can you provide BK7 lenses with D coating? Thanks, Mike
besembeson  (posted 2014-03-13 01:18:06.0)
Response from Bweh E at Thorlabs: Thanks for contacting Thorlabs. We can certainly provide N-BK7 lenses (N-BK7 is the RoHS compliant BK7)with the D-coating (R<1%, 1.8-2.4um). Note however that the transmission of N-BK7 substrate starts to decrease beyond 2µm (see "graph" tab at the following link: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=112) so even with the D-AR coating expect your transmission not to be uniform across 1.8-2.4 microns. I will send you separate email to follow up on the specific lenses you would like coated if this decrease in transmission is not a concern to you. Alternative materials to consider will be CaF2 (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5669) and MgF2 (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=901) lenses, which we also provide.
tor  (posted 2010-11-23 15:29:25.0)
Response from Tor at Thorlabs to johnybaptista: Thank you for your interest in our lenses. I will contact you directly for more information so I can help you identify the most suitable lens for your application.
johnybaptista  (posted 2010-11-23 10:22:56.0)
Hello! I´m constructing one laser distance measurement(rangefinder)and i I need help to know the better lense. Thank you
jens  (posted 2010-02-05 14:33:12.0)
A reply from Jens at Thorlabs: the focal lenght for LA1986-C at 1070nm is BFL = 124.9mm EFL = 127.0mm
jens  (posted 2010-02-05 12:22:44.0)
A reply from Jens at Thorlabs: thanks for the notification. The link has been fixed. we are currently calculating the f/fb data at 1070nm and I will send it over to you in a little bit.
gspaldin  (posted 2010-02-05 11:36:21.0)
At: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=112 The Tutorial tab graph claims you download data by clicking on it, but that is a BAD LINK. -What are the focal lengths (f and fb) at 1070nm for LA1986-C?
Laurie  (posted 2008-10-13 14:54:29.0)
Response from Laurie at Thorlabs to krishe80: Thank you for your feedback. The surface flatness is ~lambda/2 on the spherical side and ~lambda/4 on the flat side. The scratch-dig for the plano-convex lenses is 40/20. We will correct the inconsistency in our catalog. If you have further questions, please let us know.
krishe80  (posted 2008-10-12 12:27:14.0)
what is the surface accuracy on these lenses? Also in catalog scratch dig is 60-40 on website it says 40-20 which one is right?
chris.koresko  (posted 2008-02-25 13:46:17.0)
It would be nice if I could download a Zemax lens catalog (its not built into my copy of Zemax).
technicalmarketing  (posted 2007-08-24 12:28:00.0)
The lenses are now in order of increasing focal length within each lens diameter class and this page should be easier to find via the search engine. As always, we appreciate the presentation feedback and would like to thank you for the time you spent to make our website better.
acable  (posted 2007-08-23 19:30:58.0)
The lenses are sorted by Dia and then by Item# which makes it really hard to sort through the list, please sort by Dia and then by focal length then by coating.
acable  (posted 2007-07-27 15:39:28.0)
I had to work at finding the link for this page. Searched on Plano Convex Lens, then Plano Convex, then 3rd try of Plano-Convex finally got me a link.

Ø6.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1116 6.0 10.0 +100.0 5.2 2.5 1.5 8.3 Plano-Convex Lens Drawing
LA1470 6.0 12.0 +83.3 6.2 2.3 1.5 10.5
LA1222 6.0 15.0 +66.7 7.7 2.1 1.5 13.6
LA1700 6.0 30.0 +33.3 15.5 1.8 1.5 28.7
  • Suggested Fixed Lens Mounts: LMR6(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1116 Support Documentation
LA1116N-BK7 Plano-Convex Lens, Ø6.0 mm, f = 10.0 mm, Uncoated
$20.71
Today
LA1470 Support Documentation
LA1470N-BK7 Plano-Convex Lens, Ø6.0 mm, f = 12.0 mm, Uncoated
$19.38
Today
LA1222 Support Documentation
LA1222N-BK7 Plano-Convex Lens, Ø6.0 mm, f = 15.0 mm, Uncoated
$19.38
Today
LA1700 Support Documentation
LA1700N-BK7 Plano-Convex Lens, Ø6.0 mm, f = 30.0 mm, Uncoated
$19.07
Today

Ø9.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1576 9.0 12.0 +83.3 6.2 3.4 1.5 9.7 Plano-Convex Lens Drawing
LA1472 9.0 20.0 +50.0 10.3 2.5 1.5 18.3
  • Suggested Fixed Lens Mounts: LMR9(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1576 Support Documentation
LA1576N-BK7 Plano-Convex Lens, Ø9.0 mm, f = 12.0 mm, Uncoated
$21.62
3-5 Days
LA1472 Support Documentation
LA1472N-BK7 Plano-Convex Lens, Ø9.0 mm, f = 20.0 mm, Uncoated
$19.38
Today

Ø1/2" (Ø12.7 mm) N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1540 1/2" 15.0 +66.7 7.7 5.1 1.8 11.6 Plano-Convex Lens Drawing
LA1074 1/2" 20.0 +50.0 10.3 4.0 1.8 17.3
LA1560 1/2" 25.0 +40.0 12.9 3.5 1.8 22.6
LA1289 1/2" 30.0 +33.3 15.5 3.2 1.8 27.8
LA1304 1/2" 40.0 +25.0 20.6 2.8 1.8 38.0
LA1213 1/2" 50.0 +20.0 25.8 2.6 1.8 48.1
LA1207 1/2" 100.0 +10.0 51.5 2.2 1.8 98.2
  • Suggested Fixed Lens Mount: LMR05(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1540 Support Documentation
LA1540N-BK7 Plano-Convex Lens, Ø1/2", f = 15.0 mm, Uncoated
$21.62
Today
LA1074 Support Documentation
LA1074N-BK7 Plano-Convex Lens, Ø1/2", f = 20.0 mm, Uncoated
$21.32
Today
LA1560 Support Documentation
LA1560N-BK7 Plano-Convex Lens, Ø1/2", f = 25.0 mm, Uncoated
$19.69
Today
LA1289 Support Documentation
LA1289N-BK7 Plano-Convex Lens, Ø1/2", f = 30.0 mm, Uncoated
$19.38
Today
LA1304 Support Documentation
LA1304N-BK7 Plano-Convex Lens, Ø1/2", f = 40.0 mm, Uncoated
$18.97
Today
LA1213 Support Documentation
LA1213N-BK7 Plano-Convex Lens, Ø1/2", f = 50.0 mm, Uncoated
$18.87
Today
LA1207 Support Documentation
LA1207N-BK7 Plano-Convex Lens, Ø1/2", f = 100.0 mm, Uncoated
$18.87
Today

Ø18.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1859 18.0 20.0 +50.0 10.3 7.1 1.8 15.3 Plano-Convex Lens Drawing
LA1270 18.0 25.0 +40.0 12.9 5.5 1.8 21.3
LA1085 18.0 30.0 +33.3 15.5 4.7 1.8 26.8
LA1119 18.0 50.0 +20.0 25.8 3.4 1.8 47.6
  • Suggested Fixed Lens Mount: LMR18(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1859 Support Documentation
LA1859N-BK7 Plano-Convex Lens, Ø18.0 mm, f = 20.0 mm, Uncoated
$22.54
Today
LA1270 Support Documentation
LA1270N-BK7 Plano-Convex Lens, Ø18.0 mm, f = 25.0 mm, Uncoated
$21.62
Today
LA1085 Support Documentation
LA1085N-BK7 Plano-Convex Lens, Ø18.0 mm, f = 30.0 mm, Uncoated
$21.11
Today
LA1119 Support Documentation
LA1119N-BK7 Plano-Convex Lens, Ø18.0 mm, f = 50.0 mm, Uncoated
$21.11
Today

Ø25.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1252 25.0 25.4 +39.4 13.1 11.7 2.5 17.7 Plano-Convex Lens Drawing
LA1255 25.0 50.0 +20.0 25.8 5.3 2.07 46.6
LA1257 25.0 75.0 +13.3 38.6 4.10 2.02 72.2
LA1251 25.0 100.0 +10.0 51.5 3.60 2.06 97.6
LA1253 25.0 200.0 +5.0 103.0 2.80 2.04 198.1
  • Suggested Fixed Lens Mount: LMR1(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1252 Support Documentation
LA1252N-BK7 Plano-Convex Lens, Ø25.0 mm, f = 25.4 mm, Uncoated
$25.30
Today
LA1255 Support Documentation
LA1255N-BK7 Plano-Convex Lens, Ø25.0 mm, f = 50.0 mm, Uncoated
$23.05
Today
LA1257 Support Documentation
LA1257N-BK7 Plano-Convex Lens, Ø25.0 mm, f = 75.0 mm, Uncoated
$21.93
Today
LA1251 Support Documentation
LA1251N-BK7 Plano-Convex Lens, Ø25.0 mm, f = 100.0 mm, Uncoated
$21.93
Today
LA1253 Support Documentation
LA1253N-BK7 Plano-Convex Lens, Ø25.0 mm, f = 200.0 mm, Uncoated
$20.71
3-5 Days

Ø1" (Ø25.4 mm) N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1951 1" 25.4 +39.4 13.1 11.7 1.8 17.6 Plano-Convex Lens Drawing
LA1805 1" 30.0 +33.3 15.5 8.6 2.0 24.2
LA1027 1" 35.0 +28.6 18.0 7.2 2.0 30.1
LA1422 1" 40.0 +25.0 20.6 6.4 2.0 35.7
LA1131 1" 50.0 +20.0 25.8 5.3 2.0 46.3
LA1134 1" 60.0 +16.7 30.9 4.7 2.0 56.7
LA1608 1" 75.0 +13.3 38.6 4.1 2.0 72.0
LA1509 1" 100.0 +10.0 51.5 3.6 2.0 97.3
LA1986 1" 125.0 +8.0 64.4 3.3 2.0 122.4
LA1433 1" 150.0 +6.7 77.3 3.1 2.0 147.5
LA1229 1" 175.0 +5.7 90.1 2.9 2.0 172.5
LA1708 1" 200.0 +5.0 103.0 2.8 2.0 197.5
LA1461 1" 250.0 +4.0 128.8 2.6 2.0 247.4
LA1484 1" 300.0 +3.3 154.5 2.5 2.0 297.3
LA1172 1" 400.0 +2.5 206.0 2.4 2.0 397.1
LA1908 1" 500.0 +2.0 257.5 2.3 2.0 496.8
LA1978 1" 750.0 +1.3 386.3 2.2 2.0 746.1
LA1464 1" 1000.0 +1.0 515.1 2.2 2.0 995.3
  • Suggested Fixed Lens Mount: LMR1(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1951 Support Documentation
LA1951N-BK7 Plano-Convex Lens, Ø1", f = 25.4 mm, Uncoated
$23.70
Today
LA1805 Support Documentation
LA1805N-BK7 Plano-Convex Lens, Ø1", f = 30.0 mm, Uncoated
$23.20
Today
LA1027 Support Documentation
LA1027N-BK7 Plano-Convex Lens, Ø1", f = 35.0 mm, Uncoated
$22.60
Today
LA1422 Support Documentation
LA1422N-BK7 Plano-Convex Lens, Ø1", f = 40.0 mm, Uncoated
$22.30
Today
LA1131 Support Documentation
LA1131N-BK7 Plano-Convex Lens, Ø1", f = 50.0 mm, Uncoated
$21.60
Today
LA1134 Support Documentation
LA1134N-BK7 Plano-Convex Lens, Ø1", f = 60.0 mm, Uncoated
$21.40
Today
LA1608 Support Documentation
LA1608N-BK7 Plano-Convex Lens, Ø1", f = 75.0 mm, Uncoated
$21.20
Today
LA1509 Support Documentation
LA1509N-BK7 Plano-Convex Lens, Ø1", f = 100.0 mm, Uncoated
$20.50
Today
LA1986 Support Documentation
LA1986N-BK7 Plano-Convex Lens, Ø1", f = 125.0 mm, Uncoated
$20.50
Today
LA1433 Support Documentation
LA1433N-BK7 Plano-Convex Lens, Ø1", f = 150.0 mm, Uncoated
$19.90
Today
LA1229 Support Documentation
LA1229N-BK7 Plano-Convex Lens, Ø1", f = 175.0 mm, Uncoated
$19.80
Today
LA1708 Support Documentation
LA1708N-BK7 Plano-Convex Lens, Ø1", f = 200.0 mm, Uncoated
$19.60
Today
LA1461 Support Documentation
LA1461N-BK7 Plano-Convex Lens, Ø1", f = 250.0 mm, Uncoated
$19.40
Today
LA1484 Support Documentation
LA1484N-BK7 Plano-Convex Lens, Ø1", f = 300.0 mm, Uncoated
$19.40
Today
LA1172 Support Documentation
LA1172N-BK7 Plano-Convex Lens, Ø1", f = 400.0 mm, Uncoated
$19.40
Today
LA1908 Support Documentation
LA1908N-BK7 Plano-Convex Lens, Ø1", f = 500.0 mm, Uncoated
$19.40
3-5 Days
LA1978 Support Documentation
LA1978N-BK7 Plano-Convex Lens, Ø1", f = 750.0 mm, Uncoated
$19.40
Today
LA1464 Support Documentation
LA1464N-BK7 Plano-Convex Lens, Ø1", f = 1000.0 mm, Uncoated
$19.10
Today

Ø30.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1274 30.0 40.0 +25.0 20.6 9.0 2.5 34.0 Plano-Convex Lens Drawing
LA1102 30.0 50.0 +20.0 25.8 7.3 2.5 45.0
LA1765 30.0 75.0 +13.3 38.6 5.5 2.5 71.1
LA1031 30.0 100.0 +10.0 51.5 4.7 2.5 96.5
LA1907 30.0 150.0 +6.7 77.3 3.1 1.6 147.5
LA1541 30.0 200.0 +5.0 103.0 2.8 1.7 197.5
LA1832 30.0 250.0 +4.0 128.8 2.6 1.7 247.4
LA1419 30.0 300.0 +3.3 154.5 2.5 1.8 297.3
LA1237 30.0 500.0 +2.0 257.5 2.3 1.8 496.8
  • Suggested Fixed Lens Mount: LMR30(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1274 Support Documentation
LA1274N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 40.0 mm, Uncoated
$29.07
Today
LA1102 Support Documentation
LA1102N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 50.0 mm, Uncoated
$25.30
Today
LA1765 Support Documentation
LA1765N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 75.0 mm, Uncoated
$25.30
Today
LA1031 Support Documentation
LA1031N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 100.0 mm, Uncoated
$25.09
Today
LA1907 Support Documentation
LA1907N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 150.0 mm, Uncoated
$25.30
Today
LA1541 Support Documentation
LA1541N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 200.0 mm, Uncoated
$25.30
Today
LA1832 Support Documentation
LA1832N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 250.0 mm, Uncoated
$25.30
Today
LA1419 Support Documentation
LA1419N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 300.0 mm, Uncoated
$25.30
Today
LA1237 Support Documentation
LA1237N-BK7 Plano-Convex Lens, Ø30.0 mm, f = 500.0 mm, Uncoated
$25.30
Today

Ø2" (Ø50.8 mm) N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1401 2" 60.0 +16.7 30.9 16.3 3.0 49.1 Plano-Convex Lens Drawing
LA1145 2" 75.0 +13.3 38.6 12.5 3.0 66.5
LA1050 2" 100.0 +10.0 51.5 9.7 3.0 93.3
LA1384 2" 125.0 +8.0 64.4 8.2 3.0 119.2
LA1417 2" 150.0 +6.7 77.3 7.3 3.0 144.7
LA1399 2" 175.0 +5.7 90.1 6.7 3.0 170.0
LA1979 2" 200.0 +5.0 103.0 6.2 3.0 195.3
LA1301 2" 250.0 +4.0 128.8 5.5 3.0 245.5
LA1256 2" 300.0 +3.3 154.5 5.1 3.0 295.6
LA1725 2" 400.0 +2.5 206.0 4.6 3.0 395.7
LA1380 2" 500.0 +2.0 257.5 4.3 3.0 495.5
LA1727 2" 750.0 +1.3 386.3 3.8 3.0 745.0
LA1779 2" 1000.0 +1.0 515.1 3.6 3.0 994.3
  • Suggested Fixed Lens Mount: LMR2(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1401 Support Documentation
LA1401N-BK7 Plano-Convex Lens, Ø2", f = 60.0 mm, Uncoated
$36.21
3-5 Days
LA1145 Support Documentation
LA1145N-BK7 Plano-Convex Lens, Ø2", f = 75.0 mm, Uncoated
$33.66
Today
LA1050 Support Documentation
LA1050N-BK7 Plano-Convex Lens, Ø2", f = 100.0 mm, Uncoated
$29.84
Today
LA1384 Support Documentation
LA1384N-BK7 Plano-Convex Lens, Ø2", f = 125.0 mm, Uncoated
$29.58
Today
LA1417 Support Documentation
LA1417N-BK7 Plano-Convex Lens, Ø2", f = 150.0 mm, Uncoated
$29.07
Today
LA1399 Support Documentation
LA1399N-BK7 Plano-Convex Lens, Ø2", f = 175.0 mm, Uncoated
$45.90
Today
LA1979 Support Documentation
LA1979N-BK7 Plano-Convex Lens, Ø2", f = 200.0 mm, Uncoated
$29.07
Today
LA1301 Support Documentation
LA1301N-BK7 Plano-Convex Lens, Ø2", f = 250.0 mm, Uncoated
$45.90
Today
LA1256 Support Documentation
LA1256N-BK7 Plano-Convex Lens, Ø2", f = 300.0 mm, Uncoated
$31.11
Today
LA1725 Support Documentation
LA1725N-BK7 Plano-Convex Lens, Ø2", f = 400.0 mm, Uncoated
$31.11
Today
LA1380 Support Documentation
LA1380N-BK7 Plano-Convex Lens, Ø2", f = 500.0 mm, Uncoated
$31.11
Today
LA1727 Support Documentation
LA1727N-BK7 Plano-Convex Lens, Ø2", f = 750.0 mm, Uncoated
$43.86
Today
LA1779 Support Documentation
LA1779N-BK7 Plano-Convex Lens, Ø2", f = 1000.0 mm, Uncoated
$43.86
Today

Ø75.0 mm N-BK7 Plano-Convex Lenses (Uncoated)

Item #a Diameter
(mm)
Focal Length
(mm)
Diopterb Radius of Curvature
(mm)
Center Thickness
(mm)
Edge Thickness
(mm)
Back Focal Length
(mm)
Reference
Drawing
LA1740 75.0 85.0 +11.7 43.8 24.2 3.0 68.8 Plano-Convex Lens Drawing
LA1238 75.0 100.0 +10.0 51.5 19.2 3.0 87.0
LA1002 75.0 150.0 +6.7 77.3 12.7 3.0 141.1
LA1353 75.0 200.0 +5.0 103.0 10.1 3.0 192.7
  • Suggested Fixed Lens Mount: LMR75(/M)
  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LA1740 Support Documentation
LA1740N-BK7 Plano-Convex Lens, Ø75.0 mm, f = 85.0 mm, Uncoated
$86.70
Today
LA1238 Support Documentation
LA1238N-BK7 Plano-Convex Lens, Ø75.0 mm, f = 100.0 mm, Uncoated
$86.70
Today
LA1002 Support Documentation
LA1002N-BK7 Plano-Convex Lens, Ø75.0 mm, f = 150.0 mm, Uncoated
$86.70
Today
LA1353 Support Documentation
LA1353N-BK7 Plano-Convex Lens, Ø75.0 mm, f = 200.0 mm, Uncoated
$86.70
3-5 Days
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