Blog

Top Bi Telecentric Lens Suppliers for Global Buyers

Choosing a reliable bi telecentric lens supplier requires more than comparing catalog prices. Global buyers must examine optical performance, manufacturing consistency, documentation, and long-term support. A bi telecentric lens keeps chief rays nearly parallel on both sides of the lens, helping maintain stable magnification during inspection. This matters when measuring machined parts, connectors, wafers, or molded components with small height variations.

In practical vision systems, lens selection begins with the object size, sensor format, working distance, and required field of view. A 16 mm inspection target may need a different optical design from a 50 mm target, even when both cameras use the same interface. Buyers should request MTF data, distortion specifications, telecentricity tolerance, depth of field, and illumination recommendations. Ask for real test images, not only polished brochures. That is important.

A dependable supplier should also explain coating options, C-mount compatibility, calibration methods, environmental limits, and expected lead times. Experienced manufacturers can often provide custom magnification, mounting adapters, or matching telecentric illuminators. However, supplier claims are not always complete. Published tolerances may differ from production results, and delivery estimates can change. Independent validation remains necessary.

This guide reviews leading bi telecentric lens suppliers for global buyers, focusing on optical expertise, quality control, customization, technical communication, and after-sales reliability. It does not assume one supplier fits every application. The best choice depends on measurement accuracy, production volume, budget, and regional service needs. Clear specifications protect projects from expensive redesigns. Careful comparison builds confidence.

Top Bi Telecentric Lens Suppliers for Global Buyers
Table of Contents [Hide]
1 Bi-Telecentric Lenses: Definition, Structure, and Core Functions
2 Key Performance Criteria for Comparing Bi-Telecentric Lens Suppliers
3 Leading Bi-Telecentric Lens Suppliers and Their Product Strengths
4 Global Buyer Guide: Customization, Compatibility, and Quality Checks
5 Pricing, Procurement, and After-Sales Factors for International Buyers

Bi-Telecentric Lenses: Definition, Structure, and Core Functions

Bi-Telecentric Lenses: Definition, Structure, and Core Functions

A bi-telecentric lens maintains nearly parallel chief rays on both sides of the optical system. It is telecentric in object space and image space. This design keeps magnification stable when the target moves slightly along the optical axis. For global buyers, that stability matters in dimensional inspection, electronics testing, and precision assembly.

Its structure typically includes front and rear lens groups, a carefully positioned aperture stop, and a fixed optical path. The stop controls chief-ray angles and supports consistent imaging across the sensor. Many models provide low distortion and a long working distance. These features help measure holes, edges, and molded parts without strong perspective errors.

The Core Function

The core function is repeatable measurement. A metal pin near the image center should appear almost the same size as one near the edge. The lens also reduces sensitivity to small height changes. That sounds simple. It is not always enough. Poor lighting, vibration, or an unsuitable sensor can still reduce accuracy. In production inspection, users should verify working distance, field of view, depth of field, sensor compatibility, and required magnification before purchasing. A lens may perform well in a catalog test but behave differently beside a reflective surface or uneven fixture. Careful sample testing remains essential.

Key Performance Criteria for Comparing Bi-Telecentric Lens Suppliers

Top Bi Telecentric Lens Suppliers for Global Buyers

Key Performance Criteria for Comparing Bi-Telecentric Lens Suppliers

A reliable bi-telecentric lens supplier should provide measured data, not only catalog claims. Compare magnification accuracy, distortion, telecentricity, working distance, and image-circle coverage. For precision inspection, even a small magnification shift can affect dimensional results across a metal component.

Ask for MTF curves at the intended wavelength and sensor size. Confirm compatibility with the camera’s pixel pitch, mounting interface, and illumination geometry. A lens may perform well with coaxial lighting but lose contrast under ring illumination. Test evidence matters.

Look closely at repeatability.

During supplier evaluations, request inspection samples, calibration records, and tolerance information. Suppliers with practical expertise can explain how temperature, focus position, and mechanical vibration influence measurement stability. They should also disclose testing conditions, including aperture, object distance, and target material.

Cost alone can mislead. A lower-priced lens may require stronger lighting or additional calibration. That increases system expense. Conversely, premium specifications may not improve a low-resolution application. I have seen comparisons fail because teams trusted nominal distortion values without testing real parts. The better approach uses a controlled trial with edges, holes, and height differences similar to production components. Documentation should remain clear, traceable, and available for future audits.

Top Bi Telecentric Lens Suppliers for Global Buyers - Key Performance Criteria for Comparing Bi-Telecentric Lens Suppliers
Evaluation Dimension Recommended Benchmark for Professional Applications What Buyers Should Compare Verification Evidence to Request
Object-Side and Image-Side Telecentricity Critical
Prefer a design with low angular deviation on both sides; the acceptable error depends on measurement tolerance and field size.		 Confirm whether the lens is truly bi-telecentric rather than only object-space telecentric. Compare telecentricity error across the full specified field and working-distance range. Optical specification sheet, telecentricity-error plot, measurement conditions, and a sample image taken at different object distances.
Magnification Stability For dimensional inspection, magnification should remain effectively constant when the object moves within the stated depth range. A tolerance of about 0.1% or better is commonly targeted for demanding metrology. Compare magnification variation, nominal magnification, and whether the stated value applies at the calibrated working distance or throughout the usable depth of field. Certified calibration data, magnification-versus-distance curve, and dimensional test results using traceable artifacts.
Optical Distortion High-precision inspection systems commonly seek distortion below 0.1%; applications requiring tighter dimensional accuracy may require substantially lower values. Check maximum distortion, distortion type, measurement field, and whether the value is measured optically or corrected through software. Distortion map, calibration report, raw image examples, and details of any software correction or polynomial model.
Field of View and Sensor Coverage Field of view is determined by magnification and sensor size. The image circle should fully cover the selected sensor without corner shading or loss of resolution. Compare compatible sensor formats, image-circle diameter, usable field, and the relationship between magnification and field of view. Optical layout drawing, sensor-compatibility table, illumination test images, and corner-resolution measurements.
Resolution and MTF Resolution must support the smallest feature to be inspected. MTF should be evaluated at relevant spatial frequencies across the center and edges of the field. Compare MTF at multiple field positions, operating wavelengths, apertures, and working distances rather than relying only on a center-field resolution value. MTF charts, test wavelength, aperture setting, image height, test target type, and measured-versus-modeled performance data.
Depth of Field Bi-telecentric lenses are often selected for stable dimensional imaging, but usable depth of field still depends on magnification, aperture, illumination, and allowable blur. Compare depth of field at the required resolution and measurement tolerance. Avoid comparing figures measured with different blur criteria. Depth-of-field calculation, focus-stack images, allowable-circle-of-confusion value, and test results at the intended aperture.
Working Distance Working distance should provide sufficient clearance for parts, fixtures, lighting, and actuators. Common machine-vision designs may range from several dozen to several hundred millimetres. Compare nominal and usable working distance, mechanical clearance, front-element position, and performance changes near the limits of the specified range. Mechanical drawing with tolerances, working-distance performance data, and clearance recommendations for coaxial or ring lighting.
Numerical Aperture and Light Throughput Higher numerical aperture can improve resolution and light collection but generally reduces depth of field and may increase sensitivity to alignment. Compare NA, f-number, aperture adjustment range, transmission, and the balance between resolution, exposure time, and depth of field. Aperture specification, transmission curve, illumination recommendations, and sample exposure settings at the intended camera configuration.
Spectral Compatibility For visible-light inspection, performance is commonly specified across approximately 400–700 nm. Extended visible, near-infrared, ultraviolet, or monochromatic use requires dedicated verification. Compare wavelength range, chromatic aberration control, coating design, and performance when used with the selected lighting wavelength. Transmission curve, spectral MTF data, chromatic-focus-shift data, coating information, and wavelength-specific test images.
Chief-Ray Angle and Illumination Uniformity A low and consistent chief-ray angle is beneficial for sensors with direction-sensitive pixels and for uniform telecentric illumination setups. Compare chief-ray-angle data, relative illumination across the field, vignetting, and compatibility with coaxial, dome, or backlighting systems. Relative-illumination chart, chief-ray-angle data, flat-field image, and recommended lighting geometry.
Mechanical Interface Mounting thread, flange distance, adjustment access, and housing rigidity should match the camera and machine structure. Compare mount type, outer diameter, length, mass, filter access, locking features, and the availability of adapters or custom mechanical interfaces. Dimensioned CAD drawing, interface-control document, tolerance table, and vibration or mounting guidance.
Calibration and Traceability For metrology, calibration should be linked to known standards and performed under documented environmental and optical conditions. Compare calibration method, uncertainty reporting, reference artifacts, calibration interval, and whether calibration files can be supplied for machine integration. Calibration certificate, uncertainty budget, traceability statement, test procedure, and sample measurement report.
Manufacturing Consistency Production-to-production variation should be controlled for magnification, distortion, telecentricity, and focus position. Compare stated tolerances, incoming inspection, final optical testing, serial-number traceability, and availability of lot-specific test data. Quality-control plan, inspection records, acceptance criteria, and statistical process-control information where available.
Environmental Reliability Industrial installations may require resistance to temperature changes, vibration, dust, and humidity. Requirements should be defined by the machine environment. Compare operating and storage temperature, humidity limits, vibration resistance, sealing level, thermal focus shift, and service-life expectations. Environmental test reports, ingress-protection rating where applicable, thermal-drift data, and installation limitations.
Customization Capability Special applications may require non-standard magnification, working distance, spectral band, mount, filter, or image-circle dimensions. Compare engineering support, prototype capability, optical redesign limits, minimum order requirements, sample approval process, and change-control procedures. Non-disclosure and development process, prototype schedule, optical simulation, design-review documents, and first-article inspection report.
Lead Time and Supply Continuity For global projects, predictable production and replenishment are often more important than the shortest initial quotation. Compare standard versus custom lead times, production capacity, component availability, forecast requirements, packaging, and spare-unit recommendations. Formal quotation, delivery schedule, capacity statement, continuity plan, packaging specification, and replacement-part policy.
Documentation and Technical Support Complete documentation should enable optical selection, mechanical integration, calibration, operation, and troubleshooting without undocumented assumptions. Compare the quality of datasheets, drawings, manuals, optical data, integration guidance, response time, and support during commissioning. Sample technical package, application notes, installation manual, response-time commitment, and documented escalation process.
Total Cost of Ownership Purchase price should be evaluated together with calibration, adapters, lighting compatibility, integration labour, replacement risk, and expected service life. Compare delivered cost, warranty, calibration services, repair policy, spare availability, shipping terms, taxes, and cost of future design changes. Itemized quotation, warranty terms, service-rate card, repair turnaround time, shipping terms, and lifecycle-cost estimate.
Note: Performance targets are general industry benchmarks, not universal pass/fail limits. Final acceptance criteria should be defined according to the camera, wavelength, measurement uncertainty, object geometry, lighting system, and required production tolerance.

Leading Bi-Telecentric Lens Suppliers and Their Product Strengths

Bi-telecentric lens suppliers are gaining attention as automated inspection expands across electronics, packaging, and precision manufacturing. MarketsandMarkets estimates that the global machine vision market could grow from about USD 12 billion in 2023 to nearly USD 20 billion by 2028. This growth increases demand for stable optical measurement, not merely higher resolution.

Leading suppliers usually show strength in parallel-light design, low distortion, and consistent magnification. These features help inspectors measure stamped parts, connectors, and molded components without perspective errors. Strong suppliers also provide calibrated optical data, working-distance options, and compatibility guidance for industrial cameras. A useful specification sheet should state telecentricity, depth of field, resolving power, and illumination requirements clearly.

Integration experience matters.

Grand View Research identifies manufacturing automation as a major driver of machine vision adoption. In practice, experienced suppliers test lenses with real cameras, lighting angles, and production tolerances. They may offer custom mounts or short-run modifications for unusual inspection stations. However, catalog performance can differ from factory results. That gap deserves attention. Buyers should request sample images, repeatability data, and measurement results across temperature changes. Coating durability, sealing, and delivery support also reveal product strength. A lower-cost lens may look attractive, yet calibration effort can increase the total ownership cost. Supplier claims should be checked against independent trials, because optical perfection is rarely achieved in a crowded production environment.

Global Buyer Guide: Customization, Compatibility, and Quality Checks

Choosing a bi-telecentric lens supplier requires more than comparing catalog prices. Global buyers should request optical drawings, tolerance data, and a clear delivery scope. Experienced suppliers explain working distance, field of view, sensor format, mount type, and illumination requirements before recommending a model. A lens that fits mechanically may still produce poor images.

Customization should begin with measurable production conditions. Share the object size, inspection depth, wavelength, camera pixel size, and required distortion limit. Ask whether the supplier can adjust the working distance or aperture without weakening telecentric performance. Compatibility testing should include the camera flange, lighting geometry, software calibration, and available mounting space. Small errors matter. A two-millimeter mismatch can force costly fixture changes.

Quality checks need evidence, not polished promises. Request test images, MTF results, distortion measurements, telecentricity data, and inspection records from the actual production batch. Check edge sharpness, chromatic performance, coating consistency, and focus stability across temperature changes. Suppliers with documented sampling procedures are easier to evaluate and support. I have seen buyers approve a lens from one center image, then discover blurred corners during production. That mistake is avoidable, though sample testing can never reproduce every factory condition. Leave room for a pilot run, repeatability checks, and a written acceptance standard. Calibration takes time.

Pricing, Procurement, and After-Sales Factors for International Buyers

Top Bi Telecentric Lens Suppliers for Global Buyers

Pricing, Procurement, and After-Sales Factors for International Buyers

Buying a bi-telecentric lens requires more than comparing catalog prices. Magnification stability, working distance, sensor coverage, and distortion often determine the real cost. A lens priced 20% lower may require a new camera, mounting plate, or lighting system.

The International Federation of Robotics reported 541,302 industrial robot installations worldwide in 2023. This growth increases demand for reliable machine-vision inspection. Buyers should request measured data for telecentricity, distortion, resolution, and MTF, rather than relying only on marketing specifications. Ask for a sample inspection using the actual part. It exposes focus limits quickly.

Price should include calibration, export packaging, documentation, and replacement planning. Freight can also affect total procurement cost. The 2024 MarketsandMarkets Machine Vision Market report estimated growth from approximately 11.6 billion US dollars in 2023 to 19.7 billion by 2028. That expansion may improve supply availability, but it can also increase lead-time pressure for customized optics.

After-sales support deserves written terms. Confirm response times, repair procedures, calibration intervals, and spare-unit availability. A supplier should explain how temperature changes affect measurement accuracy. Warranty language must cover international returns clearly. Service quality is difficult to measure before failure. That is the uncomfortable part.

Some buyers still select suppliers from price tables alone. I have found that approach incomplete. A detailed acceptance test, shared drawings, and stable technical contacts usually protect the investment better than a small initial discount.

Article Source:

↑