How to Choose a SWIR Camera Lens for a 2/3-Inch Sensor: Image Format, Coverage, FOV and Compatibility Guide

Choosing a SWIR camera lens for a 2/3-inch sensor requires more than matching the words “2/3-inch” on a camera and lens datasheet. The lens must create an image large enough to cover the active sensor area, maintain useful sharpness toward the edges, provide the required field of view at the available working distance, support the SWIR wavelength range used by the application, and match the mechanical camera interface. For industrial machine builders, all of these variables need to work together before a lens-camera combination can be considered compatible.

Sensor format is especially important in SWIR imaging because an otherwise suitable lens can produce poor corner performance or an incorrect inspection field if its image coverage does not match the camera. A machine may have the correct 900–1700 nm spectral response and sufficient sensor resolution, yet still fail its inspection requirement because the selected focal length produces the wrong field of view or the optical image does not adequately cover the active sensor area.

The current Kyptec Automation® SWIR Camera Lens collection contains five focal lengths—8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm—and the product pages specify 2 MP resolution, F1.4 aperture, C-Mount and 900–1700 nm SWIR operation. This makes the portfolio particularly useful for OEMs that want to keep sensor format and spectral compatibility consistent while selecting focal length according to machine geometry.

What Does a 2/3-Inch Sensor Format Mean in SWIR Imaging?

The term 2/3-inch sensor is a conventional optical-format designation rather than a literal measurement of the sensor width. For lens selection, the important engineering point is that the lens must provide sufficient image coverage for the active sensor dimensions used by the SWIR camera.

A lens designed around a 2/3-inch format should produce an image field suitable for that class of sensor without forcing the camera to use only a reduced central region. If the lens coverage is too small, the image can become dark or unusable toward the corners. If the lens provides more coverage than needed, the system can still work, but the focal length and overall optical geometry must remain appropriate for the required FOV.

For buyers, “2/3-inch compatible” should therefore be interpreted as an image-format compatibility specification, not simply a mechanical label.

Sensor Coverage and Field of View Are Different Questions

Sensor coverage asks whether the lens forms a usable image across the active sensor.

Field of view asks how much of the real-world object is visible at the selected working distance.

These two questions are related but not interchangeable.

A lens may cover the entire 2/3-inch sensor perfectly yet produce a field that is much too wide for a small semiconductor component. Another lens may cover the same sensor but provide a field that is too narrow for a conveyor or sorting application.

The complete selection process should therefore answer both:

Will the lens cover the sensor?

and

Will the lens produce the required object-side FOV?

That distinction is fundamental when comparing SWIR camera lenses.

Why a Lens Intended for a Smaller Sensor Can Cause Problems

If the optical image produced by a lens does not fully cover the active sensor area, image quality toward the edges can deteriorate.

Possible symptoms include dark corners, reduced brightness near the perimeter, incomplete image coverage or reduced usable field.

For industrial inspection, this can be more serious than an image that simply looks cosmetically imperfect. A defect, material difference or dimensional edge near the side of the inspection field may become harder to detect than the same feature near the center.

This is why an OEM should verify usable full-sensor coverage instead of testing only a central target.

Why Using a Larger-Coverage Lens Does Not Automatically Improve Inspection

The opposite assumption can also be misleading. Choosing a lens that supports an image format larger than the camera sensor does not automatically increase resolution or inspection accuracy.

The camera still records only the active area of its own sensor.

What matters is whether the lens delivers sufficient optical performance across that active region and whether the focal length creates the correct FOV.

For a 2/3-inch SWIR camera, the ideal lens is therefore not necessarily the one with the largest theoretical image circle. It is the one that correctly matches the sensor format, wavelength range, field of view, working distance and required inspection detail.

Start With the Actual SWIR Camera Sensor

Before buying a lens, the camera specification should be reviewed carefully.

The OEM should identify the sensor format, active dimensions where available, pixel resolution, pixel size, spectral sensitivity and mechanical lens mount.

A specification such as “2 MP, 2/3-inch SWIR camera” is a useful starting point, but the physical sensor dimensions and active imaging area are more important when performing precise field-of-view calculations.

The current Kyptec Automation® SWIR Camera Lens family is specifically listed as a 2/3-inch format product range, making it a strong optical platform to evaluate for compatible SWIR cameras.

Focal Length Determines How Much of the Scene Reaches the 2/3-Inch Sensor

Once sensor coverage is confirmed, focal length becomes one of the most important selection parameters.

For the same 2/3-inch sensor and approximately the same working distance, a shorter focal length produces a wider field of view, while a longer focal length produces a narrower field.

This is exactly why a useful SWIR portfolio should contain several focal lengths rather than one universal lens.

The current Kyptec Automation® range spans 8.5 mm through 50 mm, allowing the same 2/3-inch sensor class to be used across very different inspection geometries.

Wide Coverage With Kyptec Automation® KL-1408

The Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens is the shortest focal-length option in the current portfolio. Its live product page specifies 8.5 mm focal length, 2 MP resolution, 2/3-inch sensor format, F1.4 aperture, C-Mount and 900–1700 nm operation.

For a 2/3-inch SWIR camera, this type of focal length is particularly relevant when the machine needs broad scene coverage from a relatively short working distance. Potential uses include wider conveyor views, sorting stations, material-identification systems and compact factory-automation machines where the camera cannot be placed far from the product.

However, the wider field also means that each object occupies fewer image pixels than it would with a longer focal length at the same distance. The OEM therefore needs to confirm that the smallest material difference, defect or object feature remains sufficiently resolved.

Intermediate Coverage With Kyptec Automation® KL-1412

The Kyptec Automation® KL-1412 25 MM SWIR Camera Lens provides a more moderate optical geometry. The live page specifies 25 mm focal length, 2 MP resolution, F1.4 aperture, 2/3-inch sensor format, C-Mount and 900–1700 nm spectral compatibility.

This makes Kyptec Automation® KL-1412 useful to evaluate where the inspection machine needs a balance between scene coverage and object magnification. Examples may include food inspection stations, electronics inspection, material classification, moisture inspection and general industrial quality-control systems.

The important point is not that 25 mm is universally preferable. It is that the same 2/3-inch sensor can produce a very different inspection field when paired with this focal length rather than an 8.5 mm lens.

Narrower Coverage and Longer Stand-Off With Kyptec Automation® KL-1416

At the longer end of the current portfolio, the Kyptec Automation® KL-1416 50 MM SWIR Camera Lens provides a 50 mm focal-length option for the same SWIR category. The current product family positions this model within the same 2/3-inch, 2 MP, F1.4, C-Mount and 900–1700 nm architecture.

A longer focal length can be useful where the camera needs greater stand-off, narrower inspection coverage or more object magnification. Semiconductor inspection machines, enclosed inspection cells and precision quality-control stations are examples where this geometry may be relevant.

This gives an OEM flexibility without changing the underlying sensor-format strategy.

How Working Distance Changes FOV on a 2/3-Inch Sensor

Focal length should never be considered independently of working distance.

If the same camera and lens are moved farther from the object, the field of view generally increases. Move the camera closer and the field becomes smaller.

For an OEM, this means several lens-working-distance combinations may theoretically produce a required field.

The correct choice should also consider machine clearance, minimum focus distance, mechanical stability, available illumination space and required image detail.

A compact machine may favour shorter working distance and a shorter focal length, while a larger inspection enclosure may benefit from greater stand-off with a longer focal length.

Why FOV Should Be Calculated Before Ordering

A common purchasing mistake is to select a focal length from previous experience and only later check whether the object fits inside the image.

The stronger method is to define the required inspection width and height first.

For example, if a SWIR system must inspect a 200 mm-wide product, the OEM should calculate which focal length can provide that field on the intended 2/3-inch sensor at the available camera distance.

If the machine instead needs to inspect a much smaller semiconductor region, the selected lens should provide enough magnification for the required feature while still covering the area of interest.

This makes FOV a buyer requirement, not an afterthought.

Resolution and Sensor Format Must Be Evaluated Together

A 2 MP label describes the number of image samples available, while 2/3-inch describes the physical sensor-format class.

Neither specification alone tells the complete story.

A buyer needs to know how many pixels represent the required object feature after the selected lens creates the final field of view.

If a 2 MP camera is used to image a very large area, individual defects may occupy too few pixels. If the same sensor images a smaller area, those features occupy more pixels and can become easier to classify.

The lens therefore determines how effectively the camera's available resolution is used.

Sensor Coverage Does Not Guarantee Edge-to-Edge Optical Performance

A lens can technically cover the sensor but still show different sharpness, brightness or distortion at the edge compared with the center.

Industrial SWIR systems should therefore be tested across the complete active area.

For material classification, representative samples should be positioned near the center and edges.

For measurement, reference targets should be checked across the field.

For semiconductor or electronics inspection, fine structures should remain sufficiently distinct at all important image positions.

Kyptec Automation® describes its SWIR camera lenses as designed for high transmission, high contrast and low distortion in demanding SWIR imaging applications. These are valuable characteristics to evaluate when full sensor utilization is important.

Vignetting Is a Key Compatibility Warning

Vignetting describes a reduction in image brightness toward the outer field.

It can arise from optical coverage, mechanical restrictions, aperture conditions or other factors.

In a SWIR inspection system, vignetting can create more than an aesthetic problem because classification algorithms may interpret brightness differences as material differences.

For example, if the same material appears brighter in the center and darker near the edge because of the optical system, a threshold-based inspection can become less stable.

This is why a 2/3-inch SWIR camera should be qualified with full-field samples rather than only one central target.

C-Mount Is the Mechanical Half of Compatibility

Sensor format addresses optical coverage, while the mount addresses physical camera-lens integration.

The live Kyptec Automation® SWIR lens pages specify C-Mount across the current portfolio.

However, a C-Mount label does not eliminate the need to verify focus range, camera flange geometry and mechanical clearance.

A professional compatibility check should therefore confirm both:

2/3-inch optical-format compatibility

and

C-Mount mechanical compatibility.

This is especially important for OEMs designing a repeatable machine rather than a one-off laboratory setup.

Minimum Focus Distance Can Affect Compact Machines

A lens may provide the right sensor coverage and focal length yet still be unsuitable if the machine requires the camera to focus closer than the lens permits.

Compact inspection stations should therefore consider minimum object distance before the bracket position is frozen.

Shorter focal-length Kyptec Automation® SWIR models provide broad coverage useful for compact configurations, while longer focal lengths naturally suit different stand-off requirements.

The correct decision is a geometry calculation rather than a simple focal-length ranking.

2/3-Inch Sensor Compatibility in Moisture Inspection

In moisture-inspection systems, spectral contrast is important, but image geometry still determines how reliably the machine can locate moisture variation.

A large product inspected with a very wide FOV may provide limited pixel density for small local moisture changes. A narrower field can increase object sampling but cover less product.

The 2/3-inch sensor therefore acts as a fixed imaging canvas, while the focal length and working distance determine how much real-world material is mapped onto it.

This is why moisture applications should select SWIR lenses from both spectral requirements and object-space resolution requirements.

2/3-Inch Sensor Compatibility in Semiconductor Inspection

Semiconductor and silicon inspection typically places more emphasis on small feature visibility and controlled geometry.

A very short focal length may cover too much area and reduce magnification for the relevant feature.

An intermediate or longer focal length may provide more useful scene scaling depending on the required working distance.

The lens must still maintain adequate sensor coverage and SWIR transmission.

For this type of application, the question should not be “Which lens fits a 2/3-inch camera?” but rather “Which 2/3-inch-compatible SWIR lens produces the required field and feature sampling at the machine's working distance?”

2/3-Inch Sensor Compatibility in Sorting and Conveyor Inspection

Sorting machines usually need a larger physical field because multiple objects or a substantial conveyor width may need to be observed.

Shorter focal lengths can therefore become attractive.

However, the wider the field, the smaller each object becomes on the sensor.

OEMs must balance throughput coverage against classification detail.

A wide-angle lens such as Kyptec Automation® KL-1408 can be evaluated where broad FOV is required, while intermediate focal lengths can be considered when the inspection needs more magnification.

Why the Five-Focal-Length Portfolio Matters

The current Kyptec Automation® SWIR Camera Lens collection contains 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm lenses while maintaining a common SWIR-focused product architecture.

This is valuable because the machine builder can potentially maintain the same 2/3-inch sensor class and C-Mount interface while choosing focal length according to the mechanical envelope.

The portfolio therefore supports a useful design philosophy:

keep the SWIR sensor-format strategy consistent and change focal length only when the FOV or working-distance requirement changes.

That is a more scalable approach than treating each machine as an unrelated optical design.

How to Specify a 2/3-Inch SWIR Lens Before Buying

A strong purchase specification should state the camera sensor format, active sensor dimensions if available, image resolution, spectral range, required horizontal and vertical FOV, working distance, smallest feature to resolve, lens mount and inspection application.

The buyer should also identify whether the application prioritizes broad coverage, small-feature visibility, longer stand-off or compact mechanical packaging.

Only then should a focal length be selected.

This is particularly important when moving from prototype to OEM production, because informal optical choices made during development can become expensive if they are copied across dozens of machines without a controlled compatibility specification.

Why Kyptec Automation® Is a Strong Choice for 2/3-Inch SWIR Camera Systems

Kyptec Automation® offers a focused SWIR portfolio rather than a single fixed focal length. The live range currently includes five 2/3-inch SWIR Camera Lens products spanning 8.5 mm to 50 mm, giving machine builders wide-angle, intermediate and longer-focal-length choices while staying within one specialized product family.

The live product pages specify 900–1700 nm operation, 2 MP resolution, F1.4 aperture and C-Mount, and describe applications including moisture detection, material identification, semiconductor inspection and industrial quality control.

For OEMs, that makes Kyptec Automation® particularly useful when the design goal is not simply to find one SWIR lens, but to build a repeatable optical platform that can support several machine geometries.

Frequently Asked Questions About SWIR Camera Lenses for 2/3-Inch Sensors

1. What does 2/3-inch mean on a SWIR camera lens?

The 2/3-inch designation refers to the optical sensor-format class the lens is intended to cover. It does not mean the active sensor is literally two-thirds of an inch wide. For buyers, the practical meaning is that the lens should provide sufficient optical image coverage for a compatible 2/3-inch SWIR sensor.

2. Can any C-Mount lens work with a 2/3-inch SWIR camera?

No. C-Mount describes the mechanical interface, while sensor coverage and wavelength compatibility are optical requirements. A lens may physically attach to the camera but still provide insufficient sensor coverage or inappropriate transmission for SWIR imaging. Both mechanical and optical compatibility must therefore be verified.

3. What happens if a SWIR lens is designed for a smaller sensor than my camera?

The active sensor may extend beyond the lens's useful image field, potentially causing dark corners, reduced edge brightness or insufficient image quality. In industrial inspection, this can produce inconsistent defect or material detection across the field, so the complete sensor area should be validated.

4. Does using a 2/3-inch lens guarantee zero vignetting?

No. Sensor-format compatibility reduces the risk of inadequate coverage, but vignetting can also depend on lens design, aperture, mechanical restrictions and system configuration. The final lens-camera combination should be tested under actual production conditions.

5. How does focal length affect FOV on a 2/3-inch SWIR sensor?

With the same sensor and similar working distance, shorter focal lengths generally provide a wider FOV, while longer focal lengths provide a narrower field and greater object magnification. This is why the Kyptec Automation® SWIR range includes multiple focal lengths rather than one universal lens.

6. Is 8.5 mm suitable for a 2/3-inch SWIR camera?

Yes, when the camera and application match the lens specification. Kyptec Automation® KL-1408 is currently specified as an 8.5 mm, 2 MP, 2/3-inch, F1.4, C-Mount SWIR lens operating across 900–1700 nm. It is particularly relevant where broad FOV is needed from a relatively compact stand-off.

7. When should I choose 25 mm instead of 8.5 mm?

A 25 mm focal length is generally more appropriate when the application needs a narrower FOV or greater object magnification at comparable geometry. Kyptec Automation® KL-1412 provides a 25 mm option within the same 2/3-inch SWIR portfolio, making it useful where balanced coverage and detail are more important than maximum angular width.

8. Why would I choose a 50 mm SWIR lens on the same sensor?

A longer focal length can provide a narrower field or accommodate greater stand-off depending on the required geometry. This can be useful for smaller inspection regions, precision machine-vision stations or applications where the camera must remain farther from the target.

9. Does a larger sensor automatically provide a wider FOV?

For the same lens and working distance, a larger active sensor generally captures a wider portion of the lens's image field, provided the lens can cover it adequately. However, switching sensor size changes the optical system and should always be checked for image-circle coverage and edge performance.

10. Does a smaller sensor improve image quality with the same SWIR lens?

Not automatically. A smaller sensor uses a more central portion of the optical image, which can avoid some outer-field limitations, but overall inspection quality still depends on pixel size, sensor resolution, focal length, working distance, contrast and the size of the feature being inspected.

11. How should I calculate the required SWIR lens before buying?

Start with the physical sensor dimensions, required FOV and available working distance. Those parameters define the focal-length range required by the machine. Then verify SWIR spectral compatibility, aperture, mount, minimum focus distance and required object-side resolution before ordering.

12. Is 2 MP enough for a 2/3-inch SWIR inspection system?

It can be, depending on the field of view and smallest feature the machine must resolve. Resolution should always be evaluated in object space. A 2 MP sensor viewing a narrow inspection area can represent small features much more densely than the same sensor covering a very large conveyor.

13. Can the same 2/3-inch SWIR lens be used for food and semiconductor inspection?

Potentially, but the optimum focal length and working distance may be very different. Food sorting may require a wider field, while semiconductor inspection may need greater magnification over a smaller region. The shared 2/3-inch format establishes camera compatibility, but the application geometry still determines the lens.

14. Why is full-field testing important with a 2/3-inch SWIR sensor?

Industrial systems frequently use most of the active sensor area. If brightness, focus or distortion changes substantially near an edge, inspection performance may vary with object position. Testing representative features at the center and outer field helps confirm that the complete sensor area is usable.

15. Should sensor dimensions or the 2/3-inch label be used for precise FOV calculations?

Use the actual active sensor dimensions when available. The 2/3-inch designation is useful for compatibility screening, but precise FOV engineering is stronger when based on the manufacturer's active sensor width and height together with lens focal length and working distance.

16. Does SWIR wavelength affect sensor coverage?

Spectral range and physical sensor coverage are separate specifications, although both influence final performance. The lens must cover the physical sensor while also transmitting and focusing the SWIR wavelengths required by the application. A correct system therefore needs both spectral and geometric compatibility.

17. What should an OEM include in a SWIR lens compatibility specification?

The specification should include sensor format, active dimensions, resolution, wavelength range, required FOV, working distance, focal length target, mount, minimum feature size and intended application. This gives procurement and engineering a repeatable compatibility standard rather than relying only on a lens model name.

18. Why is Kyptec Automation® a strong option for 2/3-inch SWIR camera systems?

Kyptec Automation® currently provides five SWIR Camera Lens focal lengths—8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm—within one 2/3-inch-oriented product family. The portfolio combines 900–1700 nm SWIR compatibility, 2 MP resolution, F1.4 aperture and C-Mount architecture, giving OEMs a practical range for selecting different fields of view and working distances without moving away from a coherent SWIR lens platform.

Conclusion

Selecting a SWIR camera lens for a 2/3-inch sensor is fundamentally an exercise in matching optical coverage and machine geometry. The sensor-format label establishes the starting point, but a successful industrial system also requires the correct focal length, field of view, working distance, sensor resolution, spectral compatibility and mechanical mount.

The first question should be whether the lens adequately covers the active 2/3-inch sensor. The second should be whether the resulting field of view matches the real inspection area. The third should determine whether enough sensor pixels remain across the smallest defect, material feature or dimensional edge that the machine must identify.

This is why focal-length selection cannot be separated from sensor size. An 8.5 mm SWIR lens can give broad coverage on a 2/3-inch sensor, an intermediate focal length such as 25 mm can provide a more balanced inspection geometry, and a 50 mm option can support narrower fields or longer stand-off. None is universally better; each is useful when its geometry matches the machine.

The live Kyptec Automation® SWIR Camera Lens collection provides five focal lengths from 8.5 mm to 50 mm, with the current product family specified around a 2/3-inch sensor format, 2 MP resolution, F1.4 aperture, C-Mount and 900–1700 nm SWIR operation. That makes Kyptec Automation® a particularly useful platform for OEMs that want to standardize around one SWIR sensor class while retaining the freedom to adapt field of view and working distance across multiple industrial inspection machines.

The most reliable buying principle is therefore simple: do not choose a SWIR lens merely because both the camera and lens say “2/3-inch.” Confirm that the lens covers the complete sensor, calculate the FOV from the actual working distance, verify sufficient object-side resolution and then select the focal length that fits the physical machine. When sensor format, coverage and geometry are engineered together, the 2/3-inch specification becomes a useful design standard rather than just another number on the datasheet.