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See all 9 Products in Family

TECHSPEC^® components are designed, specified, or manufactured by Edmund Optics. Learn More

4.0mm Diameter x 4.0mm Length, N-LASFN9 Half-Drum Lens

Name: 4.0mm Diameter x 4.0mm Length, N-LASFN9 Half-Drum Lens
Brand: TECHSPEC
SKU: 46-531
Price: S$30.09

Stock #46-531 Clearance 3-5 days

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S$30^.09

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S$30.09

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EO Spec Sheet

Specifications
Product Details
Technical Information
Accessories
Related Products
Custom
Imaging Lens Selector
Frequently Purchased Together
Resources

Specifications

General

Type:

Half-Drum Lens

Physical & Mechanical Properties

Diameter (mm):

4.00

Length (mm):

4.00

Length Tolerance (μm):

±30

Radius Tolerance (μm):

+0/-1.5

Diameter Tolerance (μm):

+0/-50

Optical Properties

N-LASF9

Coating:

Uncoated

Wavelength Range (nm):

380 - 2500

Index of Refraction (n_d):

1.850

Radius R (mm):

2.50

Surface Quality:

40-20

Regulatory Compliance

RoHS:

Compliant

Certificate of Conformance:

View

Product Details

Easier to Mount and Handle Than Standard Ball Lenses

Drum lenses are glass spheres, ground down axially to provide a mounting surface. The ground circumference D simplifies handling issues typically associated with ball lenses. Ideal for optical transmission in fiber communications. Type B Drum lenses have a polished plano-surface for direct fiber contact and perform as elongated PCX lenses.

Technical Information

D	Radius R	Length	Length L2	Stock No.
Type A Drum Lenses
2mm	1.25mm	2.5mm	1.5mm	#45-548
				#45-739
				#45-836
				#45-663
				#45-743
2.4mm	1.5mm	3mm	1.8mm	#45-549
				#45-837
				#45-664
				#45-744
3.2mm	2mm	4mm	2.4mm	#45-550
				#45-741
				#45-838
				#45-665
				#45-745
4mm	2.5mm	5mm	3mm	#45-551
				#45-839
				#45-742
				#45-666
Type B Half-Drum Lenses
2mm	1.25mm	2mm	1.5mm	#46-524
				#46-528
2.4mm	1.5mm	2.4mm	1.8mm	#46-525
				#46-529
3.2mm	2mm	3.2mm	2.4mm	#46-526
				#46-530
4mm	2.5mm	4mm	3mm	#46-527
				#46-531

Accessories

Related Products

#13-800 - Small Lens Clamp for 4-8mm Dia. Optics

S$233.45

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

Custom dimensions, materials, coatings, and more
High-precision surface quality and flatness
Tight tolerances and complex geometries
Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

Imaging Lens Selector

Frequently Purchased Together

#32-746 - 6.0mm Diameter, N-BK7 Ball Lens

S$59.09

#32-747 - 8.0mm Diameter, N-BK7 Ball Lens

S$63.44

#32-748 - 10.0mm Diameter, N-BK7 Ball Lens

S$76.85

#34-460 - 18mm Dia. x 8.4mm FL, Uncoated Molded Aspheric Condenser Lens

S$46.40

Resources

Filter

Anti-Reflection (AR) Coatings

Anti-reflection (AR) coatings are applied to optical components to increase throughput and reduce hazards caused by back-reflections.

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An Introduction to Optical Coatings

Optical coatings are used to influence the transmission, reflection, or polarization properties of an optical component.

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Lens Geometry Performance Comparison

This comparison of the performance of aspheric, achromatic, and spherical PCX lenses in different situations reveals the ideal use cases for each type of lens.

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Understanding Optical Specifications

Do you want to know more about the importance of optical specifications? Learn the different types of specifications and their impact on your system at Edmund Optics.

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SAG Calculator

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Future of Spherical Lenses

Traditional spherical lenses are evolving due to the increasing demands of applications. Learn about the future of spherical lenses at Edmund Optics.

View Now

Edge-Blackening

Have a question about Edge-Blackening? Find more information on stray light, measuring BRDF, and more at Edmund Optics.

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Geometrical Optics 101: Paraxial Ray Tracing Calculations

Do you use ray tracing on a regular basis? Learn more about the calculations aspect, along with steps and software at Edmund Optics.

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Optics Application Examples

Looking for application examples? Find examples for Detector Systems, Selecting the Right Lens, and Building a Projection System at Edmund Optics.

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Understanding Optical Lens Geometries

Optical lens geometries control light in different ways. Learn about Snell's Law of Refraction, lens terminology and geometries at Edmund Optics.

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Precision Tolerances for Spherical Lenses

Optical lenses require very precise tolerances. Learn more about tolerances for spherical lenses at Edmund Optics.

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Keys to Cost Effective Optical Design and Tolerancing

Are you looking for ways to make cost effective optical designs? Find more information on selecting specifications and using tolerancing schemes at Edmund Optics.

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How do I clean my lenses?

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Is it possible to find Plano-Concave (PCV) or Double Concave (DCV) lenses where the diameter is greater than the focal length?

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How does reversing the orientation of a PCX lens affect the EFL and BFL in a setup?

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Double-Concave (DCV) Lens

View Now

Double-Convex (DCX) Lens

View Now

Meniscus Lens

View Now

Plano-Concave (PCV) Lens

View Now

Plano-Convex (PCX) Lens

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Advantages of Using Meniscus Lenses in Infrared Applications

Meniscus lenses offer superior performance compared to plano convex lenses in IR applications. Find out the benefits of using a meniscus lens at Edmund Optics.

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How to Design your own Beam Expander Using Stock Optics

Are standard beam expanders not meeting your application requirements? Learn how to design your own beam expander using stock optics at Edmund Optics.

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Modifying Stock Optics Tip #3: Turn A Sphere Into An Asphere

Join Andrew Fisher, Manufacturing R&D Engineer at Edmund Optics, as he discusses some tips for modifying stock optical components to fit your application's needs.

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I am looking to prototype an illumination system. My objective is to use a small halogen filament bulb and end up with a beam of light. What would be the best lens or lens combination to give me this projected spot of light?

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What is the difference between the effective focal length and the back focal length?

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What are the benefits of aspheric lenses compared to standard singlet lenses?

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Back Focal Length (BFL)

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Field Curvature

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Sag

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Rapid Optical Prototyping

Quickly Respond to Collapsing Product Lifecycles

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Optical Glass

Choosing the right optical glass is important. Find out factors and properties on how to select the right optical glass at Edmund Optics.

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Aberrations

Need help understanding aberration theory? Learn about a few fundamental concepts to help clarify your understanding at Edmund Optics.

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The Airy Disk and Diffraction Limit

The diffraction pattern caused when light passes through an aperture is called the Airy Disk. Find out how the Airy Disk can impact your image at Edmund Optics.

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What is the difference between an inked lens and a non-inked one?

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If I want to design with your lenses and lens assemblies, how do I get the information that I need?

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Now that I have chosen my lens, how do I mount it?

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Center Thickness (CT)

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Chromatic Focal Shift

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Conjugate Distance

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Épaisseur de bord

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Distance focale effective (EFL)

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Finite/Finite Conjugate

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Power

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Singlet Lens

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When doing basic imaging, how do you determine the magnification an optical lens will provide?

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Understanding Collimation to Determine Optical Lens Focal Length

Collimated light occurs when light rays travel parallel to each other.

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How to Form an Image with an Optical Lens Setup

Although a common misconception, individual optical lenses do not always form an image when the object plane is placed a focal length away from the lens.

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Modifying Stock Optics Tip #4: Add A Coating To A Stock Lens

Join Andrew Fisher, Manufacturing R&D Engineer at Edmund Optics, as he discusses some tips for modifying stock optical components to fit your application's needs.

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Irregularity

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Radius of Curvature

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Diopter

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The surface quality of optical components the scattering off of its surface, which is especially important in laser optics applications.

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Seamed Edge

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An understanding of refraction and basic ray optics is a critical foundation for understanding more complicated optical concepts and technologies.

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Integration of Optical Systems

Are you looking to use integration in your next system? Find out more about integrating in both imaging and non-imaging applications at Edmund Optics.

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Stock and Custom Optics Manufacturing Capabilities

Edmund Optics is a global stock and custom optics manufacturing company with in house optical designers and on-site metrology and environmental testing.

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Edmund Optics Global Manufacturing Facilities

Edmund Optics® (EO) manufactures millions of precision optical components and subassemblies every year in our 5 global manufacturing facilities.

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Metrology at Edmund Optics: Measuring as a Key Component of Manufacturing

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Surface Quality

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