SWIR Camera Lens Field of View Guide: How 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm Change Inspection Coverage

Choosing the correct SWIR camera lens field of view is one of the most important optical decisions in an industrial inspection machine because focal length determines how much of the product, conveyor, material surface or component can be captured by the camera from a given working distance. A SWIR lens may be fully compatible with the required 900–1700 nm wavelength range and the camera sensor, yet the inspection system can still fail if the field of view is too wide, too narrow or provides insufficient object detail for the required defect or material feature.

For machine builders, the practical choice between 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm SWIR camera lenses is therefore not simply a comparison of focal-length numbers. Shorter focal lengths provide broader inspection coverage at a given working distance, while longer focal lengths provide narrower coverage and greater object magnification. The right selection depends on inspection width, sensor format, camera position, minimum feature size, mechanical clearance and how much of the object must be represented by the available camera pixels.

The live Kyptec Automation® SWIR Camera Lens collection currently contains exactly five focal-length options: 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm. The current portfolio is specified around 2 MP resolution, 2/3-inch format, F1.4 aperture, C-Mount and 900–1700 nm SWIR operation. This creates a particularly useful focal-length ladder for OEMs because the spectral and sensor-platform requirements can remain consistent while inspection coverage changes according to machine geometry.

What Does Field of View Mean in a SWIR Inspection System?

Field of view, commonly abbreviated as FOV, is the physical area of the object or scene that appears on the camera sensor. In an industrial SWIR system, this might be the width of a conveyor, the surface of a food product, a semiconductor region, a plastic sorting zone, a textile section or another material-inspection area.

FOV is controlled primarily by sensor dimensions, lens focal length and working distance. For the same camera sensor and the same camera-to-object distance, a shorter focal length gives a wider field, while a longer focal length gives a narrower field. Increasing working distance also increases the covered area.

The buying decision should therefore start with the required inspection coverage in millimetres, not with a preferred focal length.

Why FOV Must Be Defined Before the Lens Is Purchased

A common machine-vision mistake is to choose a lens first and then position the camera wherever necessary to make the product fit.

That approach can create an impractical machine.

The correct sequence is to define:

the maximum object width;

the required inspection height;

the available camera-to-product distance;

the sensor format;

and the smallest feature that needs to remain detectable.

Once those requirements are known, the focal-length class becomes much easier to select.

For example, a sorting machine inspecting a broad conveyor may naturally need an 8.5 mm or 12.5 mm lens, while a semiconductor station looking at a much smaller region can require 35 mm or 50 mm depending on available stand-off.

Shorter Focal Length Means Wider Inspection Coverage

With the same sensor and working distance, reducing focal length expands the angular field of view.

This allows more of the production scene to fit onto the sensor.

The advantage is greater physical coverage.

The trade-off is lower object magnification.

When a large conveyor width is compressed onto the same 2 MP sensor, every millimetre of material is represented by fewer pixels than it would be in a narrower field.

This is why a wide-angle SWIR camera lens is useful for broad material inspection but is not automatically the correct choice when the system must resolve very small features.

Longer Focal Length Means Narrower Coverage and Greater Object Detail

A longer SWIR focal length captures a smaller physical region from the same working distance.

That may sound like a disadvantage, but for many inspection tasks it is exactly what the system needs.

If a camera only needs to inspect a 50 mm semiconductor area, there is little value in covering 500 mm of surrounding space. A tighter field allows the available sensor pixels to be concentrated over the actual region of interest.

Longer focal lengths are therefore particularly relevant where the machine requires:

smaller inspection regions;

greater stand-off;

greater apparent object size;

or more efficient use of camera resolution over a limited field.

Kyptec Automation® KL-1408: 8.5 mm for the Widest Coverage

The Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens provides the shortest focal length in the current SWIR portfolio. Its verified specifications include 8.5 mm focal length, F1.4 aperture, 2 MP resolution, C-Mount and 900–1700 nm wavelength operation. The current datasheet specifies a 2/3-inch field angle of approximately 54.8° × 42.6°. This makes it the broadest-coverage option in the Kyptec Automation® SWIR family.

For OEMs, this geometry can be especially useful for wide conveyor inspection, material sorting, food inspection, agricultural sorting or compact factory-automation machines where the camera must see a comparatively large area from limited stand-off.

The wide field should still be checked against minimum feature size. If the smallest material difference becomes too small on the 2 MP sensor, an intermediate focal length or additional camera may provide a stronger inspection architecture.

Kyptec Automation® KL-1410: 12.5 mm for Broad but More Controlled Coverage

The Kyptec Automation® KL-1410 12.5 MM SWIR Camera Lens provides a useful step between very wide-angle and intermediate inspection geometry. Its live specifications include 12.5 mm focal length, F1.4, 2 MP, 2/3-inch format, C-Mount and 900–1700 nm operation. The verified datasheet specifies approximately 39.1° × 29.8° for the 2/3-inch field angle.

This focal length is particularly relevant when 8.5 mm provides more scene coverage than necessary but 25 mm would make the field too narrow.

Potential machine types include sorting systems, food-quality stations, pharmaceutical inspection equipment, printing applications and material-classification systems where broad coverage is still needed but the OEM wants greater object detail than the shortest focal length provides.

Kyptec Automation® KL-1412: 25 mm for Balanced SWIR Inspection Geometry

The Kyptec Automation® KL-1412 25 MM SWIR Camera Lens occupies the middle of the five-lens focal-length range. Its specifications include 25 mm focal length, F1.4, 2 MP, 2/3-inch format, C-Mount and 900–1700 nm SWIR operation.

The verified 2/3-inch field angle is approximately 20.1° × 15.2°.

For many industrial systems, this type of geometry provides a useful balance between inspection width and object magnification. It can be evaluated for moisture-detection stations, material identification, electronics inspection, food inspection and controlled factory-automation systems where neither maximum scene width nor extreme narrow-field imaging is required.

Kyptec Automation® KL-1414: 35 mm for Narrower Precision Coverage

The Kyptec Automation® KL-1414 35 MM SWIR Camera Lens provides a longer focal length for more restricted inspection fields. Its current product page confirms 35 mm focal length, 2 MP, 2/3-inch format, F1.4, C-Mount and 900–1700 nm operation. The verified 2/3-inch field angle is approximately 14.4° × 10.8°.

This makes Kyptec Automation® KL-1414 useful to evaluate where an OEM needs a relatively narrow field, increased working distance or greater object representation on the camera sensor.

Potential examples include semiconductor inspection, electronics inspection, controlled material-analysis stations and precision SWIR quality-control systems.

Kyptec Automation® KL-1416: 50 mm for the Tightest Coverage in the Current Range

The Kyptec Automation® KL-1416 50 MM SWIR Camera Lens provides the longest focal length in the current collection. Its live specification confirms 50 mm focal length, F1.4 aperture, 2 MP resolution, 2/3-inch sensor format, C-Mount and 900–1700 nm operation. The verified 2/3-inch field angle is approximately 10.0° × 7.5°.

This creates the narrowest angular coverage among the five models.

For machine builders, this geometry can be particularly useful where the camera needs longer stand-off, the region of interest is comparatively small, or the application needs to devote more of the sensor to a limited inspection area.

How Dramatically the Five Focal Lengths Change Coverage

The difference becomes easier to understand if all five lenses are considered at the same nominal working distance.

Using their published horizontal angular fields as a simplified geometric reference, at approximately 500 mm working distance, the theoretical horizontal scene widths are roughly:

8.5 mm: about 518 mm;

12.5 mm: about 355 mm;

25 mm: about 177 mm;

35 mm: about 126 mm;

50 mm: about 88 mm.

These values are geometric illustrations rather than guaranteed production FOV specifications because real working-distance definitions, focus position, sensor dimensions and lens behaviour should be confirmed in the final machine.

The comparison still demonstrates the central engineering principle: moving from 8.5 mm to 50 mm on the same sensor class can transform the camera from a broad-area inspection system into a much tighter inspection system without changing the SWIR wavelength platform.

Working Distance Changes the FOV for Every Focal Length

Focal length is only one half of the field-of-view calculation.

If a 12.5 mm lens is moved farther from the product, it covers more area. Move it closer and the inspection field becomes smaller.

This creates flexibility for OEMs, but working distance should not be treated as unlimited.

Camera position may be constrained by:

machine guarding;

illumination systems;

conveyor structures;

product access;

minimum focus distance;

or service requirements.

The ideal lens is therefore the focal length that produces the required FOV within the working-distance range the machine can realistically support.

Why the Smallest Feature Should Be Calculated Together With FOV

The wider the field, the fewer camera pixels are available per millimetre of object width.

Suppose a 2 MP camera provides approximately 1600 horizontal pixels. If those pixels cover 400 mm, object sampling is approximately 4 pixels/mm.

If the same sensor covers 100 mm, object sampling becomes approximately 16 pixels/mm.

This does not mean every feature can be detected at exactly those theoretical limits because lens resolution, SWIR contrast, sensor response and image processing also matter. However, it demonstrates why FOV and smallest feature should always be specified together.

A machine that can see the complete product may still lack enough object sampling to identify the required defect or material region.

Wide FOV Is Valuable in Material Sorting

Automated material-sorting systems often need to observe multiple objects moving across a relatively broad conveyor.

Short focal lengths such as 8.5 mm or 12.5 mm can therefore be attractive.

The SWIR system may use material-dependent contrast to separate plastics, food products, agricultural materials or other objects.

However, wider coverage must still preserve enough image detail for each individual item.

If the conveyor becomes too wide for the available 2 MP sensor, using a narrower FOV per camera or multiple camera stations may give better classification reliability.

Intermediate FOV Is Useful for Moisture and Quality Inspection

Moisture inspection frequently needs a balance between coverage and local detail.

If the field is too narrow, the camera may inspect only a small portion of the product.

If it is excessively wide, localized moisture differences may occupy too few sensor pixels.

Intermediate focal lengths such as 25 mm can therefore be useful to evaluate when the inspection station needs both meaningful surface coverage and sufficient spatial detail.

The final decision should still be based on real samples because the useful contrast depends on wavelength, moisture difference and material properties.

Narrow FOV Can Be Better for Semiconductor and Electronics Inspection

Semiconductor and electronics applications commonly require inspection of relatively small physical regions.

In these systems, a wide-angle lens may waste valuable sensor area on surroundings that do not contribute to the inspection.

A 35 mm or 50 mm SWIR lens can provide a more concentrated field depending on working distance and sensor geometry.

This can make small structures occupy a larger portion of the available image while still retaining the 900–1700 nm SWIR capability required by the application.

FOV Must Include Position Tolerance

The required field should not equal the nominal product width exactly when the object can move within the machine.

If a 100 mm product can shift ±5 mm, an inspection width of exactly 100 mm provides no positioning margin.

The OEM should calculate:

maximum product size;

expected positional shift;

alignment tolerance;

and any required edge margin.

Only after this full envelope is known should the lens be selected.

The goal is sufficient coverage without creating unnecessary empty space that reduces object sampling.

FOV Must Be Verified in Both Horizontal and Vertical Directions

Industrial buyers often focus only on horizontal width.

That can be a mistake.

A camera may cover the required width while missing important vertical regions of the product.

The Kyptec Automation® datasheets provide both horizontal and vertical field-angle information for the SWIR lenses, allowing machine builders to evaluate the complete imaging rectangle rather than one dimension alone.

This is especially important for sorting, packaging and component-inspection systems where product orientation can vary.

Do Not Confuse Field Angle With Field of View

Field angle is expressed in degrees.

Field of view is the physical scene dimension at a particular working distance.

A lens may have a fixed nominal angular field for a given sensor format, but the physical FOV changes as camera distance changes.

For example, a 39° horizontal field covers a much larger physical width at 1000 mm working distance than it does at 300 mm.

This distinction is important when reading a SWIR camera lens datasheet.

FOV and Depth of Field Are Different Specifications

A lens may provide the correct field of view while still having insufficient depth of field.

FOV determines how much of the scene is included.

Depth of field determines how much variation in object distance can remain acceptably focused.

If a food-sorting system has objects of different heights, a wide FOV does not automatically mean all objects will be sharply imaged.

The aperture and focus strategy must therefore be evaluated separately.

FOV and Wavelength Are Also Different Decisions

The 900–1700 nm specification defines the spectral region the lens is intended to support.

FOV defines the geometric area captured by the camera.

Changing from an 8.5 mm lens to a 50 mm lens does not provide “more SWIR.” Both can belong to the same SWIR wavelength platform while creating dramatically different inspection coverage.

This separation between spectral and geometric design is fundamental to professional SWIR system selection.

Why a Five-Lens Focal-Length Range Is Useful for OEM Design

The Kyptec Automation® SWIR Camera Lens collection gives machine builders a continuous progression from very broad to narrow fields using 8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm focal lengths.

That enables an OEM to establish several machine-geometry classes while retaining a common SWIR architecture.

A broad conveyor system can begin with the shorter end of the range. A moderate inspection cell can evaluate the intermediate options. A precision or longer-stand-off machine can move toward 35 mm or 50 mm.

This is a more structured approach than selecting unrelated SWIR optics independently for every machine.

How to Select the Correct Focal Length Before Buying

The strongest buying sequence is:

define the maximum required FOV;

define working-distance limits;

confirm 2/3-inch sensor compatibility;

define the smallest useful material feature or defect;

calculate required object sampling;

and then choose the focal length.

The selected lens should finally be tested with the actual camera, SWIR illumination and representative product.

This makes the purchase decision based on real inspection performance rather than simply assuming that shorter means better coverage or longer means better detail.

Why Kyptec Automation® Is a Strong SWIR FOV Selection Platform

Kyptec Automation® offers five dedicated focal lengths inside one SWIR camera lens category, spanning from 8.5 mm wide-angle coverage through 50 mm narrow-field geometry. The current range maintains common 900–1700 nm, 2 MP, 2/3-inch, F1.4 and C-Mount specifications while changing focal length according to inspection geometry.

This makes Kyptec Automation® particularly useful for OEMs building multiple SWIR machine-vision platforms because the optical selection can begin with one coherent product family rather than mixing unrelated lens architectures.

Frequently Asked Questions About SWIR Camera Lens Field of View

1. Which SWIR focal length gives the widest field of view?

Within the current Kyptec Automation® SWIR portfolio, the shortest focal length—8.5 mm—provides the widest angular field on the specified 2/3-inch format. The verified datasheet lists approximately 54.8° × 42.6°. This makes it particularly useful where broad inspection coverage is required from comparatively short stand-off.

2. Which SWIR focal length gives the narrowest field of view?

The 50 mm option provides the narrowest angular coverage in the current range. Kyptec Automation® KL-1416 is therefore useful to evaluate where the inspection region is relatively small or the camera must operate from greater stand-off.

3. Does a wider FOV reduce object detail?

For a fixed camera resolution, a wider field spreads the available pixels across a larger physical area. Individual defects or material features therefore occupy fewer pixels. This is why inspection width should always be evaluated together with the smallest feature the machine needs to identify.

4. How does working distance change SWIR camera FOV?

Increasing the camera-to-object distance generally increases the physical FOV, while reducing the distance narrows it. This gives OEMs some flexibility, but machine clearance, minimum focus distance and optical performance limit how far the camera position can be adjusted.

5. Is 8.5 mm always better for conveyor inspection?

No. It is useful when broad coverage is required, but the resulting object magnification may be too low for small features. A 12.5 mm or 25 mm lens may provide a better balance if the conveyor width does not require the maximum field.

6. When should I choose 12.5 mm instead of 8.5 mm?

Choose the 12.5 mm class when the 8.5 mm field is broader than necessary and you want more object representation while retaining relatively wide coverage. Kyptec Automation® KL-1410 provides this intermediate wide-angle option within the current SWIR range.

7. Is 25 mm a good general-purpose SWIR focal length?

It can be a very useful intermediate geometry because it sits near the center of the current focal-length range. Kyptec Automation® KL-1412 can be evaluated when the machine needs more magnification than a wide-angle system without moving to the narrow fields of 35 mm or 50 mm.

8. When does a 35 mm SWIR lens make sense?

A 35 mm lens becomes attractive when the inspection region is comparatively limited, more stand-off is available or the system needs greater object magnification. It can be particularly relevant to controlled semiconductor, electronics and precision material-inspection machines.

9. Can I calculate SWIR FOV from focal length alone?

No. Focal length must be combined with sensor dimensions and working distance. The 2/3-inch optical-format label is useful for compatibility, but precise calculations should use the actual active sensor dimensions whenever available.

10. Should the product exactly fill the camera FOV?

Usually not. Some positional margin should be included for product movement, alignment variation and manufacturing tolerances. At the same time, excessive empty margin wastes available sensor resolution, so the safety allowance should be engineered rather than arbitrary.

11. Can two different focal lengths produce the same FOV?

Yes, if their working distances are different. A shorter focal length positioned closer and a longer focal length positioned farther away may sometimes produce similar fields. Mechanical clearance, perspective, focus, depth of field and inspection resolution can still make one configuration more suitable.

12. Does changing focal length change the SWIR wavelength range?

No. Focal length changes the imaging geometry, while wavelength compatibility describes the spectral range. The current Kyptec Automation® SWIR portfolio uses different focal lengths while retaining the common 900–1700 nm design range.

13. Is wider FOV better for moisture inspection?

Only when the application genuinely needs to inspect a larger area. If localized moisture differences are small, an excessively wide field may reduce the number of pixels available to represent those regions. The ideal field covers the required product area while maintaining enough spatial detail.

14. Why is a narrow FOV useful in semiconductor SWIR inspection?

A narrow field can concentrate the camera's available resolution on a smaller physical area, allowing important semiconductor or silicon features to occupy more image pixels. Longer focal lengths such as 35 mm or 50 mm can therefore be useful where machine geometry supports them.

15. Do I need to test both horizontal and vertical FOV?

Yes. A system that fits the product horizontally can still crop important regions vertically. Both dimensions should be checked using the actual sensor, working distance and product orientation before the machine design is approved.

16. How much extra FOV margin should an OEM provide?

There is no universal percentage. The margin should reflect real product-position tolerance, conveyor tracking, mechanical alignment and required edge visibility. The objective is to cover every valid product position without wasting a large portion of the sensor on unused background.

17. What information should I provide when asking for a SWIR focal-length recommendation?

Provide the camera sensor format and active dimensions, required horizontal and vertical FOV, available working distance, smallest feature size, SWIR wavelength requirement and mechanical constraints. Those values make focal-length selection far more reliable than stating the application name alone.

18. Why is Kyptec Automation® useful for SWIR field-of-view selection?

Kyptec Automation® offers five SWIR focal lengths—8.5 mm, 12.5 mm, 25 mm, 35 mm and 50 mm—within one 2 MP, 2/3-inch, F1.4, C-Mount and 900–1700 nm family. This allows OEMs to move systematically from broad-angle inspection to narrow-field precision imaging while remaining within one specialized SWIR optical platform.

Conclusion

Field of view is one of the most important specifications to calculate before purchasing a SWIR camera lens because it determines how much of the real-world inspection scene is mapped onto the available camera sensor. Selecting the wrong focal length can produce an image that is technically sharp and spectrally correct yet still unsuitable for the machine because the coverage is too broad, too narrow or provides insufficient pixel density for the required feature.

The Kyptec Automation® SWIR portfolio provides a clear progression. The Kyptec Automation® KL-1408 8.5 MM SWIR Camera Lens provides the broadest field in the current range. The 12.5 mm option narrows that coverage while retaining a relatively wide viewing geometry. The 25 mm focal length provides an intermediate balance. The 35 mm option moves toward precision and greater stand-off, while the Kyptec Automation® KL-1416 50 MM SWIR Camera Lens provides the tightest angular coverage of the five.

Because the live Kyptec Automation® SWIR Camera Lens collection maintains 900–1700 nm, 2 MP, 2/3-inch, F1.4 and C-Mount specifications across the focal-length family, OEMs can approach FOV selection as a controlled geometry decision rather than changing the complete SWIR optical platform each time the inspection width changes.

For sorting machines, food inspection, moisture detection, plastic and material classification, pharmaceutical inspection, semiconductor imaging, electronics inspection and other industrial SWIR systems, the selection principle remains the same: start with the physical area that must be inspected, define the smallest meaningful feature, confirm the available working distance and sensor dimensions, then choose the focal length that covers the required field without wasting sensor resolution. When field of view and object detail are engineered together, the SWIR camera lens becomes properly matched to the inspection task rather than merely compatible with the camera.