Nikon 50 MM Lens for Line Scan Cameras: Sensor Length, Pixel Size, Scan Width and Working Distance Explained

A line scan imaging system places very different demands on a lens than a conventional two-dimensional inspection station. Instead of capturing a complete frame at once, the camera records one narrow line of pixels repeatedly while the material, product or camera moves. The final image is reconstructed from thousands of sequential lines, which means optical geometry must remain consistent across the full active sensor length and throughout continuous production. For an engineer evaluating a 50 MM line scan lens, the critical questions are therefore not limited to focal length. Sensor length, pixel pitch, number of pixels, required scan width, working distance, line rate, conveyor speed, focus stability and usable image coverage all need to be considered together.

The Nikon 50 MM Camera Lens category available through Kyptec Automation® currently centers on the Nikon AF NIKKOR 50 MM F/1.8D, a fixed 50 MM, F1.8, F-Mount lens. The live product page positions it for machine vision, industrial inspection, measurement, image capture and factory automation, making it relevant for evaluation in compatible industrial imaging systems where the mechanical and optical requirements support F-Mount integration. The Nikon 50 MM Camera Lens category and Nikon AF NIKKOR 50 MM F/1.8D product page provide the current product reference for OEMs and machine-vision integrators. (Kyptec Automation®)

Why Line Scan Lens Selection Starts With Sensor Length

The active sensor in a line scan camera is normally defined primarily by its length rather than by a conventional width-and-height format. A camera may contain 2K, 4K, 8K or another number of pixels arranged across one active line, and the physical length of that line depends on the pixel pitch. This physical sensor length determines how much of the lens image is sampled and has a direct relationship with the scan width that can be covered at a particular working distance.

For this reason, two 4K line scan cameras can require different optical treatment if their pixels have different physical dimensions. A 4K sensor with relatively large pixels is physically longer than a 4K sensor built with smaller pixels. When both use the same fixed 50 MM lens at the same working distance, the physically longer sensor generally captures a wider object-space region. An OEM should therefore never request a lens merely for a “4K line scan camera.” The specification should include active sensor length and pixel pitch so the lens geometry can be evaluated correctly.

Pixel Count and Pixel Pitch Must Be Considered Together

Pixel count describes how many samples are available across the line, while pixel pitch describes the physical spacing between those samples. These two values together determine the active sensor length. A simplified relationship is:

Active sensor length = number of pixels × pixel pitch

For example, a hypothetical 4,096-pixel line sensor with a 7 µm pixel pitch has an active length of approximately 28.7 MM. The same 4,096 pixels at 3.5 µm would create an active sensor approximately 14.3 MM long. Even though both cameras are described as 4K systems, the lens sees very different sensor geometries.

That difference matters when considering the Nikon AF NIKKOR 50 MM F/1.8D for industrial line scan use. The exact camera sensor must fit within the usable image area of the lens, and the resulting optical geometry must provide the required scan width without forcing the system to an impractical working distance.

Scan Width Is the Line Scan Equivalent of Field of View

In line scan imaging, the dimension across the sensor is commonly treated as the scan width or cross-web field of view. If the system is inspecting a continuous roll of film, paper, textile, foil or another moving material, this dimension usually needs to cover the complete web width plus enough margin for lateral movement.

A 600 MM web, for example, may require a scan width larger than 600 MM if edge position varies during production. However, excessive scan-width margin should be avoided because the camera has a fixed number of pixels. Every additional millimetre of coverage reduces the number of pixels available per millimetre of material.

The correct line scan optical design therefore uses the smallest scan width that safely captures the entire production envelope. This improves object-space sampling while retaining enough edge clearance for process variation.

How a 50 MM Fixed Focal Length Influences Scan Width

Because the Nikon AF NIKKOR 50 MM F/1.8D uses a fixed 50 MM focal length, scan width is primarily controlled through the physical sensor length and lens-to-object geometry. Increasing the working distance generally increases the width of the object represented across the sensor, while reducing the working distance narrows the field and increases magnification.

A simplified first-order relationship for preliminary design is:

Scan Width ≈ Sensor Length × Working Distance ÷ Focal Length

This is useful for initial machine-layout calculations but should not be treated as a guaranteed production measurement because real lens behavior differs from an idealized thin-lens model, especially as focusing distance becomes shorter.

If a hypothetical line scan sensor is approximately 20 MM long and the lens operates around 500 MM from the object, a 50 MM focal length gives a first-order scan-width estimate of approximately 200 MM. Increasing working distance toward 1,000 MM would approximately double the estimated scan width. These examples illustrate the geometry; the final system should always be measured with the actual camera, Nikon 50 MM lens and production target.

Working Distance Should Be Established Before the Machine Frame Is Finalized

Line scan cameras are frequently installed above or beside continuously moving production material. The available working distance may be constrained by illumination assemblies, rollers, inspection tunnels, guarding, process equipment, heat, contamination controls or maintenance access. This makes working distance a mechanical parameter as well as an optical parameter.

A machine builder should therefore define an acceptable optical mounting range before releasing the inspection-frame design. If a camera must operate between 450 MM and 600 MM from the material surface, the selected sensor and Nikon 50 MM lens should be evaluated within that range. If achieving the required scan width would require much greater stand-off, the optical configuration may not fit the machine even though the mathematics are otherwise correct.

This is one reason fixed 50 MM optics can be attractive in larger inspection frames: where suitable mechanical stand-off exists, the focal length can support a controlled scan geometry without requiring a very close lens-to-material position.

Convert Scan Width Into Object-Space Pixel Size

One of the most important line scan calculations is object-space sampling. It shows how much physical material each camera pixel represents across the scan direction.

The basic relationship is:

Object-space pixel size = Scan Width ÷ Number of sensor pixels

Suppose a 4,096-pixel line scan camera covers 400 MM. The sampling becomes approximately:

400 ÷ 4096 = 0.0977 MM per pixel

That is approximately 97.7 µm per pixel across the scan direction.

If the scan width expands to 800 MM while the same camera is retained, sampling becomes approximately 195 µm per pixel. The camera and lens have not lost pixels, but each pixel now represents twice as much physical material.

This calculation is far more meaningful to an industrial buyer than simply asking whether a 50 MM lens can be used on a particular camera resolution.

The Smallest Defect Should Determine Required Cross-Scan Sampling

Line scan lens selection should ultimately be connected to the smallest defect the machine must detect. If a web inspection system needs to identify a 0.5 MM contamination particle, the engineer should determine how many pixels will represent that feature across the sensor direction.

Using the earlier example of approximately 0.1 MM per pixel, a 0.5 MM feature spans roughly five pixels. If scan width is doubled and sampling drops to approximately 0.2 MM per pixel, the same feature spans only about 2.5 pixels.

Whether that is sufficient depends on defect contrast, illumination, sensor noise, algorithm performance and the direction of the defect. The important principle is that scan width should be designed from defect requirements rather than from the desire to maximize coverage.

Line Scan Resolution Has Two Directions, Not One

A reconstructed line scan image contains resolution in two different directions. Across the scan, spatial resolution is determined largely by sensor pixel count, pixel pitch, optical magnification and scan width. In the direction of material travel, resolution is determined by line acquisition rate relative to material speed.

This distinction is essential. An optical system can provide excellent cross-scan resolution while the reconstructed image becomes stretched or undersampled in the motion direction because line rate is too low.

For a square sampling geometry, the distance travelled by the material between successive captured lines should approximately match the object-space pixel size across the scan, unless the application intentionally uses different sampling in the two axes.

The lens therefore forms only one part of the complete resolution architecture.

Line Rate Must Be Matched to Conveyor Speed

Suppose the material moves at a known velocity and the desired sampling in the travel direction is 0.1 MM per line. The required line rate is determined by how many 0.1 MM increments pass the camera each second.

A faster conveyor requires a higher line rate to preserve the same longitudinal sampling. If the camera cannot acquire lines quickly enough, features become compressed, stretched or inadequately sampled in the reconstructed image.

The Nikon 50 MM lens cannot correct a line-rate mismatch. Its role is to form a sufficiently detailed image across the active sensor. Camera speed, encoder synchronization and motion control must then preserve comparable sampling along the material movement direction.

Sensor Length Must Fit Within the Usable Lens Image

F-Mount compatibility alone does not guarantee that every line scan sensor will be adequately covered. A physically long sensor requires a correspondingly large usable image field.

The Nikon AF NIKKOR 50 MM F/1.8D should therefore be evaluated across the complete active sensor length of the intended camera. The central region may appear sharp while the outer sensor positions show more brightness variation or reduced detail. For a line scan system, these edge regions can correspond directly to the edges of the inspected material.

A suitable qualification target should extend across the entire scan width so that center-to-edge behavior can be examined under the intended working distance and aperture.

Why Edge Performance Is Especially Important in Wide Line Scan Inspection

A defect near the center of a 1-metre web and an identical defect near its edge should ideally be detected with comparable reliability. If lens performance or illumination changes significantly toward the ends of the sensor, algorithm thresholds that work in the center may become less reliable at the edges.

This means full-width inspection requires more than nominal sensor coverage. Engineers should check sharpness, brightness, distortion and defect contrast across the complete line.

If only part of the active sensor provides adequate performance for the required application, the usable scan width may need to be reduced. This is better than assuming that every nominal sensor pixel contributes equally to production inspection.

Why Fixed 50 MM Geometry Can Be Useful for Continuous Inspection

Continuous inspection systems benefit from optical stability. Once a fixed 50 MM lens is installed at a validated working distance, the relationship between sensor length and material width can remain consistent as long as the mechanical structure remains stable.

This repeatability is valuable when software uses fixed calibration, defect-size thresholds or mapped web coordinates. If the optical magnification changes after commissioning, reported defect dimensions and positions may change even though the physical material has not.

The Nikon AF NIKKOR 50 MM F/1.8D provides a fixed focal-length architecture, which can be useful where the machine manufacturer wants to establish and reproduce a stable line scan geometry across identical production systems.

F1.8 Can Be Valuable for High-Speed Line Scan Imaging

The live product page identifies F1.8 as the maximum aperture of the Nikon AF NIKKOR 50 MM F/1.8D. (Kyptec Automation®) A relatively large maximum aperture can be useful in line scan inspection because each sensor line may have only a short exposure period, particularly on fast-moving production lines.

More available optical signal can help the camera operate with shorter exposure times or lower electronic gain. However, using the lens at its maximum aperture is not automatically the best production setting. Depth of field, edge performance and focus tolerance also matter.

OEM integration should therefore test several practical aperture settings and select the one that provides sufficient signal while maintaining required full-width image quality.

Depth of Field Matters When the Web Is Not Perfectly Flat

Line scan calculations often assume the inspected surface remains on one fixed plane. Real material can flutter, bow, wrinkle or vary in height.

When the material surface moves away from the nominal focus position, fine defect contrast can fall. A wide web may also show different height behavior near its center and edges depending on transport mechanics.

Closing the aperture can increase focus tolerance, but this reduces light. The correct configuration therefore balances illumination intensity, exposure time and depth of field according to the actual web movement.

For the Nikon 50 MM lens, production validation should include realistic material-height variation rather than a perfectly flat stationary calibration target alone.

Scan Width and Working Distance Must Be Balanced Against Machine Vibration

Longer working distance can help a 50 MM lens cover a wider scan width, but greater physical stand-off can also make camera mounting more mechanically demanding. Long brackets or elevated inspection frames may be more susceptible to vibration.

Small angular movement of the camera can translate into significant positional movement across a wide material field. This may affect defect mapping and edge tracking even when optical focus remains acceptable.

The line scan camera, F-Mount interface and Nikon 50 MM lens should therefore be supported as a rigid optical assembly. Mechanical stability is part of image quality in continuous inspection.

F-Mount Integration Must Be Engineered for the Exact Line Scan Camera

The Nikon AF NIKKOR 50 MM F/1.8D uses F-Mount. (Kyptec Automation®) A line scan camera must therefore provide an appropriate interface directly or use a suitable industrial adapter.

The adapter is not merely a mechanical convenience. Its dimensional accuracy influences the position of the lens relative to the sensor and therefore the available focus range. Mechanical play can also affect alignment and repeatability.

Before finalizing an OEM design, the complete lens-camera-adapter assembly should be tested at the actual working distance and then secured against unwanted movement.

Scan Width Should Include Lateral Material Movement

A moving web does not necessarily remain perfectly centered. Roll alignment, steering systems and process variation can cause the material to shift laterally.

If the scan width equals the nominal material width exactly, even small movement can push an edge outside the captured region. The required field should therefore include the maximum expected web wander plus an appropriate engineering margin.

However, unnecessarily large margins reduce pixels per millimetre. The best optical design is based on measured lateral movement rather than arbitrary extra coverage.

This is especially important for high-resolution defect inspection, where every additional millimetre of unused scan width reduces the sampling available for actual material.

The 50 MM Lens Should Be Evaluated Differently for Narrow and Wide Webs

A relatively narrow inspection width may allow the Nikon 50 MM lens to operate at a shorter working distance, increasing magnification and providing more sensor samples per millimetre. A much wider web may require greater stand-off, reducing object-space sampling.

The same lens can therefore support very different inspection resolutions depending on the machine geometry.

This is why the phrase “50 MM line scan lens” does not describe a fixed inspection capability. Its real performance must always be expressed together with sensor length, working distance, scan width and required defect size.

Film, Foil and Paper Inspection Require Different Contrast Strategies

Continuous materials may share similar geometric requirements while presenting very different optical contrast. Transparent film, reflective foil and textured paper can respond differently to the same illumination.

The lens determines image formation, but the lighting must reveal the defect. A pinhole, scratch, wrinkle, contaminant or coating variation may require transmitted, diffuse, directional or other controlled illumination depending on the material.

For the Nikon 50 MM Camera Lens, the most reliable qualification therefore combines the final lens geometry with the final illumination method rather than evaluating optical sharpness in isolation.

Textile Line Scan Inspection Adds Surface-Height and Texture Variation

Textile and fabric inspection can involve woven texture, periodic structure, loose fibers and local height variation. These characteristics make both resolution and focus tolerance important.

A 50 MM line scan geometry should provide sufficient cross-web sampling to resolve the smallest defect while maintaining adequate depth of field for the fabric surface. The line rate must also preserve comparable sampling along the moving direction.

Kyptec Automation® identifies textile among the major industrial application areas for the Nikon 50 MM Camera Lens, making this a relevant machine-vision environment for application-specific evaluation. (Kyptec Automation®)

Printing Machinery Requires Stable Image Scale

Printing and converting inspection frequently requires detection of registration errors, missing print, streaks, marks or code-quality problems across moving material. Stable optical magnification is important because software may compare printed features against expected physical dimensions or positions.

A fixed 50 MM focal length can help maintain a repeatable optical relationship once the camera position has been established.

The system should still be calibrated at the intended working distance and tested across the complete print width because both optical and illumination uniformity influence inspection consistency.

Electronics Line Scan Inspection Can Demand Fine Sampling

Some electronics and component-production processes use continuous or indexed material that can benefit from line scan inspection. These applications may involve fine conductors, repeating components or narrow surface features.

Where a Nikon 50 MM lens is evaluated, engineers should work backward from the smallest meaningful feature to determine the required object-space sampling. Sensor pixel count and nominal lens sharpness should not replace this calculation.

The product page lists electronics and special-purpose machines among relevant industrial application areas for the Nikon 50 MM Camera Lens. (Kyptec Automation®)

A 50 MM Lens Is Not Automatically Suitable for Every 2K, 4K or 8K Camera

Camera labels such as 2K, 4K and 8K describe pixel count, not complete optical geometry. An 8K sensor with very small pixels can have a physical length similar to a lower-resolution sensor with larger pixels, while another 8K design may be substantially longer.

Therefore, compatibility must be established from active sensor length, pixel pitch, image coverage and required scan width.

The Nikon AF NIKKOR 50 MM F/1.8D should not be described as universally compatible with every line scan resolution class without validation. The stronger engineering approach is to qualify the exact camera-lens combination.

Calculate Defect Size in Both Image Directions

A defect can be narrow across the web and long in the travel direction, or the opposite. Cross-scan sampling depends on sensor pixels and optical magnification. Along-scan sampling depends on line rate and material speed.

For example, a scratch only 0.2 MM wide but several millimetres long may require excellent cross-scan resolution even if travel-direction sampling is relatively forgiving. A small circular contaminant requires adequate sampling in both axes.

Production requirements should therefore specify the minimum defect dimensions in both directions.

Encoder Synchronization Supports Repeatable Spatial Sampling

On variable-speed lines, a fixed line rate can cause spatial sampling in the travel direction to change as conveyor speed changes. Encoder-triggered acquisition can help maintain a more consistent relationship between physical movement and captured lines.

This is not a lens property, but it directly affects how optical resolution is translated into the final reconstructed image. A carefully selected Nikon 50 MM lens cannot provide stable defect dimensions if the motion-direction sampling continually changes.

For quantitative inspection, optical geometry and motion synchronization should therefore be validated as one system.

Production Validation Should Cover the Entire Sensor Length

Final qualification should use representative material across the complete scan field. Place known defects or resolution features near the center, intermediate positions and both edges. Test at the intended working distance, aperture, illumination and production speed.

The purpose is to confirm that the smallest required feature remains detectable everywhere the material can appear.

This full-width test is more meaningful than a single central resolution target because continuous industrial inspection depends on uniform performance across the entire material width.

Why Nikon AF NIKKOR 50 MM F/1.8D Can Be Considered for Controlled Line Scan Integration

The Nikon AF NIKKOR 50 MM F/1.8D provides a fixed 50 MM focal length, F1.8 maximum aperture and F-Mount, while the Kyptec Automation® product page positions it for industrial machine vision, inspection, measurement and automation applications. (Kyptec Automation®) These characteristics make it a relevant option to evaluate where an OEM's calculated line scan geometry calls for a 50 MM focal length and the selected camera can be integrated appropriately.

Its suitability should always be determined from the actual sensor. A physically short sensor, long sensor, small pixel pitch or large scan width can create very different requirements even when all systems use the same 50 MM focal length.

Industrial buyers can review the Nikon 50 MM Camera Lens category and the Nikon AF NIKKOR 50 MM F/1.8D product page while developing the final camera and machine specification.

Frequently Asked Questions About Nikon 50 MM Lens Integration With Line Scan Cameras

1. What line scan camera specifications should I know before evaluating a Nikon 50 MM lens?

You should know the number of pixels, pixel pitch, active sensor length, maximum line rate, mount configuration and required scan width. Also define working distance and minimum defect size. These parameters allow the Nikon AF NIKKOR 50 MM F/1.8D to be evaluated against the real machine geometry rather than simply matching the lens to a camera described as 2K, 4K or 8K.

2. Why is active sensor length important for a 50 MM line scan lens?

Active sensor length determines how much of the lens image is sampled across the line. A longer sensor generally produces a wider object-space field at the same focal length and working distance, provided the lens offers sufficient usable image coverage. It also means the lens must maintain acceptable image quality farther from the optical axis.

3. How does pixel pitch change line scan lens requirements?

Pixel pitch determines the physical size of each detector sample and, together with pixel count, establishes sensor length. Smaller pixels can sample finer optical detail, but they also make lens performance, focus and motion control more demanding. Pixel pitch should therefore be considered alongside scan width and minimum defect size rather than as an isolated specification.

4. How do I calculate approximate scan width with a Nikon 50 MM lens?

For preliminary planning, scan width can be estimated from active sensor length, working distance and the fixed 50 MM focal length. A simplified relationship is sensor length multiplied by working distance and divided by focal length. The final width should always be measured with the actual camera and Nikon 50 MM lens because real optical geometry differs from the simplified model.

5. How do I calculate microns per pixel in a line scan inspection system?

Divide the physical scan width by the number of active sensor pixels and convert the result into micrometres if required. For example, a 409.6 MM scan width captured by 4,096 pixels corresponds to approximately 0.1 MM, or 100 µm, per pixel. This value helps determine whether the smallest production defect will occupy enough pixels for reliable inspection.

6. Can I increase scan width simply by moving the camera farther away?

Generally, increasing working distance increases scan width with a fixed 50 MM lens. However, this also reduces magnification and increases object-space pixel size, meaning small defects occupy fewer pixels. Greater stand-off can also make mechanical stability more challenging. Working distance should therefore be optimized rather than maximized.

7. How much scan-width margin should I allow for web movement?

Measure the maximum lateral movement of the material during realistic production and include enough additional width to keep both edges inside the captured field. Avoid excessive safety margin because unused coverage reduces pixels per millimetre. The margin should be based on process capability and web-guiding performance rather than an arbitrary percentage.

8. Does the F1.8 aperture help with fast line scan applications?

The F1.8 maximum aperture of the Nikon AF NIKKOR 50 MM F/1.8D provides useful light-gathering capability, which can support shorter exposure periods when appropriate. (Kyptec Automation®) However, the best production aperture may be smaller if the system needs greater depth of field or better tolerance to material-height variation. Final settings should be established experimentally.

9. Can Nikon AF NIKKOR 50 MM F/1.8D be used on every F-Mount line scan camera?

F-Mount compatibility alone is not enough to guarantee suitability. The active sensor length, required image circle, pixel pitch, working distance and image-quality requirement must also be compatible. The complete camera-lens system should be evaluated across the entire active line before production use.

10. Why are the edges of a line scan image sometimes softer than the center?

Edge softness can result from optical field performance, focus alignment, sensor position, aperture, mechanical tilt or other system factors. Because wide line scan sensors use image regions farther from the optical axis, edge qualification is important. Test the smallest production defect at several positions across the scan rather than assuming center performance represents the whole sensor.

11. How does conveyor speed affect the resolution of a 50 MM line scan system?

The lens and sensor determine sampling across the scan direction, while conveyor speed relative to line rate determines sampling along the direction of movement. If the material moves faster without increasing line rate, the physical spacing between captured lines becomes larger. Defects can therefore be undersampled even when cross-scan lens resolution remains unchanged.

12. Why does web flutter reduce line scan image quality?

Web flutter moves the inspected surface toward and away from the nominal focus plane. If this movement exceeds the available depth of field, fine defects lose contrast. The effect can be reduced through better material control, suitable aperture selection, appropriate working distance and sufficient illumination to support the chosen aperture.

13. Is a 50 MM lens better for narrow or wide line scan fields?

Neither universally. A 50 MM focal length can support different scan widths depending on sensor length and working distance. A narrow field may allow higher object magnification and more pixels per millimetre, while a wide field may require greater stand-off. The Nikon 50 MM lens should therefore be selected from the required geometry, not from a generic narrow-versus-wide rule.

14. What should an OEM test before approving a Nikon 50 MM lens for line scan production?

Test sensor coverage, focus, edge-to-edge defect visibility, illumination uniformity, scan width, pixels per millimetre, line-rate performance, actual production speed, material-height variation and mechanical stability. Run representative good and defective material through the complete inspection width. This demonstrates whether the lens-camera combination meets the production requirement rather than simply producing an attractive static image.

15. Why consider the Nikon 50 MM Camera Lens available through Kyptec Automation® for a line scan machine?

The Nikon AF NIKKOR 50 MM F/1.8D provides a clearly defined 50 MM fixed focal length, F1.8 maximum aperture and F-Mount, and Kyptec Automation® positions the product for machine vision, industrial inspection, measurement and automation. (Kyptec Automation®) When an OEM's sensor length, scan width and working-distance calculations point toward a 50 MM configuration, it provides a practical optical option to evaluate and qualify for a controlled line scan system.

Conclusion

Selecting a Nikon 50 MM lens for a line scan camera requires more engineering than simply matching focal length to a camera mount. The physical length of the line sensor, number of pixels, pixel pitch, required scan width and available working distance collectively determine the optical magnification and object-space sampling. Once those relationships are established, the engineer must still confirm full-sensor coverage, defect visibility, focus tolerance, illumination, motion-direction sampling and mechanical stability.

The most useful line scan metric is therefore not camera resolution by itself but how much real material each pixel represents. A 4K camera inspecting a narrow web can provide substantially finer object-space sampling than the same 4K camera covering a much wider web. Increasing working distance can expand scan width but reduces defect representation, while reducing working distance improves magnification but may no longer cover the entire material. Successful design comes from balancing these constraints rather than optimizing one of them independently.

The Nikon AF NIKKOR 50 MM F/1.8D provides a fixed 50 MM focal length, F1.8 maximum aperture and F-Mount, with its Kyptec Automation® product page specifically positioning it for industrial machine vision, inspection, measurement and controlled automation environments. (Kyptec Automation®) For compatible line scan systems whose calculated optical geometry genuinely requires a 50 MM focal length, its fixed architecture can provide a stable basis for controlled imaging once the camera, adapter, working distance and illumination are properly qualified.

For OEMs and machine builders evaluating the Nikon 50 MM Camera Lens, the final purchasing decision should therefore answer four measurable questions: How long is the active sensor? What is its pixel pitch? What scan width must the machine cover? At what working distance must that width be achieved? When those parameters align and full-width production testing confirms the required defect detection, the Nikon 50 MM lens can become a repeatable optical component within high-quality industrial line scan inspection rather than simply a 50 MM lens attached to a line scan camera.