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China has become an important sourcing center for precision machine-vision optics. Its manufacturers serve electronics, packaging, automotive, semiconductor, and laboratory inspection markets. The search term “object space telecentric len” often refers to an object-space telecentric lens. This lens keeps magnification stable when object distance changes slightly. It also reduces perspective errors at the image edge.
A reliable manufacturer should provide more than catalog specifications. Buyers need measured telecentricity, distortion data, working distance, resolution, and compatible sensor details. Ask how each lens is tested. Look for clear inspection records, calibration methods, and traceable quality procedures. A useful evaluation may include imaging a metal reference plate under controlled lighting. Small dimensional changes should remain consistent across the field of view. That detail matters.
Experience is visible in practical design choices. A supplier may offer coaxial illumination, adjustable apertures, modular mounts, or custom flange options. These features can simplify integration around a crowded production line. However, product pages are not enough evidence. Some specifications may appear impressive but lack test conditions. That is where comparison becomes difficult.
This guide introduces leading China object-space telecentric lens manufacturers and their typical strengths. It considers optical performance, customization ability, manufacturing experience, communication, and after-sales support. Company rankings should not be treated as permanent. Real project results can differ. Samples, drawings, and application tests remain essential before purchase. A careful choice begins with the measurement problem, not the lowest quotation.
Object-Space Telecentric Lenses: Definition and ≤0.1° Telecentricity
An object-space telecentric lens keeps chief rays nearly parallel before they reach the sensor. This geometry reduces magnification changes caused by object height. A machined pin stays visually consistent, even when its position shifts slightly along the optical axis. Telecentricity of ≤0.1° means the chief-ray angle remains within one tenth of a degree. That is a demanding measurement condition.
In production, engineers use these lenses for dimensional inspection, edge detection, and semiconductor component measurement. A narrow field of view, stable lighting, and rigid mounting remain essential. The lens cannot correct poor fixturing. Small alignment errors still matter. The 2024 MarketsandMarkets Machine Vision Market report estimates growth from approximately USD 16.9 billion in 2024 to USD 25.4 billion by 2029. This expansion reflects rising demand for repeatable automated inspection, where optical uncertainty directly affects yield decisions.
When comparing China-based manufacturers, buyers should request measured telecentricity curves, not only nominal specifications. Ask how the angle was tested, at which working distance, and across what image field. The Global Machine Vision Market report by Grand View Research identifies metrology and quality inspection as important application areas. Yet reported figures can differ between laboratories. That deserves attention. A ≤0.1° claim may describe the optical center only, rather than the full usable field. Practical verification should include calibrated targets, temperature checks, and repeated measurements at several object heights.
| Technical Dimension | Typical Specification or Requirement | Definition and Practical Significance |
|---|---|---|
| Lens Type | Object-space telecentric lens | A lens designed so that the chief rays are parallel, or nearly parallel, in object space. This helps maintain consistent feature size when object position changes along the optical axis. |
| Object-Space Telecentricity | ≤ 0.1° | The maximum chief-ray angle relative to the optical axis on the object side. A value of 0.1° corresponds to approximately 1.75 mrad and indicates high angular uniformity. |
| Measurement Accuracy Benefit | Low perspective error | Object dimensions are less affected by moderate height or position variations, making the design suitable for dimensional inspection, metrology, gauging, and automated optical inspection. |
| Magnification | Fixed magnification; commonly selected from approximately 0.1× to 1.0× | Telecentric lenses are generally optimized for a defined magnification. The correct value depends on the object field of view and the camera sensor size. |
| Working Distance | Fixed distance, often approximately 65–200 mm in machine-vision designs | The distance from the front optical reference to the object plane. A fixed working distance supports repeatable lighting, fixturing, and inspection geometry. |
| Field of View | Specified at a particular magnification and sensor format | The visible object area is determined by sensor dimensions divided by magnification. For example, a 12 mm sensor dimension at 0.5× magnification gives an approximate 24 mm object-space field in that direction. |
| Distortion | Typically specified below 0.1% for precision inspection designs | Low distortion reduces geometric deviation between the object and its image. The actual value must be verified across the usable image field. |
| Depth of Field | Application-dependent; commonly increased by stopping down the aperture | Depth of field depends on magnification, numerical aperture, acceptable image blur, illumination, and sensor pixel size. A telecentric layout does not eliminate focus limitations. |
| Numerical Aperture | Selected according to resolution, light level, and depth-of-field requirements | Higher numerical aperture can improve resolving power and light collection, but it generally reduces depth of field and may increase sensitivity to alignment. |
| Sensor Compatibility | Must match the camera sensor format and image circle | Common industrial sensor formats include 1/1.8-inch, 2/3-inch, 1-inch, 4/3-inch, and larger. The lens image circle should cover the sensor without mechanical or optical vignetting. |
| Wavelength Range | Often designed for visible wavelengths around 400–700 nm | For ultraviolet, near-infrared, or multispectral inspection, coatings, glass selection, focus shift, and telecentric performance should be specified for the required wavelength band. |
| Aperture Control | Manual or fixed iris; application-specific f-number | Stopping down can improve depth of field and reduce some aberrations, while excessive stopping may introduce diffraction and lower fine-detail contrast. |
| Mounting Interface | Common machine-vision interfaces include C-mount and larger industrial mounts | The mount must provide adequate thread compatibility, flange distance, mechanical stability, and clearance for the selected camera and lighting system. |
| Calibration Requirement | Recommended for precision measurement applications | A calibrated target can be used to verify scale, distortion, image-center alignment, and repeatability after the lens, camera, lighting, and working distance are installed. |
| Typical Applications | Dimensional inspection, edge measurement, semiconductor and electronics inspection, pharmaceutical packaging, and precision gauging | The main advantage is stable image scale with reduced perspective error, especially when parts have height variation or must be measured across a broad field. |
Note: Specifications shown as typical ranges or design requirements are application-dependent. Final telecentricity, distortion, resolution, working distance, and field-of-view values should be confirmed from the manufacturer’s optical test report for the selected lens configuration.
