Machine Vision Lens for Optical Sorting Machines: How to Select FOV, Resolution and Working Distance for High-Speed Sorting Systems

Optical sorting machines are built to inspect, classify and separate products at production speed by analyzing visible differences in size, shape, orientation, surface condition, geometry or other image features. These systems are widely used in food and beverage processing, pharmaceutical production, electronic-component handling, plastics processing, general industrial parts sorting, automated grading and special-purpose machinery. Unlike a simple inspection station that observes one controlled component, an optical sorting machine may need to image many moving objects simultaneously across a wide belt, chute, feeder or multi-lane transport system. The Machine Vision Lens therefore has a direct influence on how much sorting area can be captured, how many native pixels are available on each object and whether the smallest classification feature remains visible at the required working distance.

For OEMs searching for a machine vision lens for optical sorting machine, high-speed sorting camera lens, industrial sorting machine vision lens, camera lens for automatic sorting system, machine vision lens for grading machine, optical sorter camera lens, or high-resolution lens for sorting machine, the strongest selection process begins with three variables: physical field of view, required object-side resolution and practical camera working distance. Focal length should be selected only after these parameters are understood.

The current Kyptec Automation® Machine Vision Lens collection includes conventional 5 MP, 10 MP and 25 MP Machine Vision Lens families across focal lengths including 8 mm, 12 mm, 16 mm, 25 mm, 35 mm and 50 mm. Kyptec Automation® describes these lenses for industrial cameras, factory automation, high-speed inspection, defect detection and measurement, while its listed application areas include food and beverage processing, pharmaceutical, electronics, textile, special-purpose machines and broader factory automation.

Optical Sorting Lens Selection Should Begin With the Sorting Width

The first optical parameter for many sorting machines is the total physical width that must be inspected. A narrow component sorter may require only a relatively small field, while a multi-lane sorting system can require several hundred millimetres of coverage.

The Machine Vision Lens must generate enough FOV to include every legitimate object position without unnecessarily imaging machine structure outside the sorting region. Excessive FOV reduces pixels per millimetre and therefore reduces the number of native image pixels assigned to each object.

This makes the sorting width to sensor-resolution relationship more important than focal length alone.

Calculate Pixels per Millimetre Across the Sorting Zone

A practical starting calculation is:

Pixels per millimetre = sensor pixels across the relevant direction ÷ physical FOV in millimetres

If a sensor provides 5,000 horizontal pixels over a 500 mm sorting width, simplified sampling is approximately 10 pixels/mm. A 5 mm object feature would therefore occupy approximately 50 pixels in that direction.

If the same sensor covers 1,000 mm, sampling falls to approximately 5 pixels/mm, leaving only around 25 pixels across the same feature.

The calculation should be performed using the smallest feature that separates one sorting class from another, not merely the average product dimensions.

The Smallest Classification Feature Determines the Real Optical Requirement

Optical sorting systems often process products that are easy to detect as objects but difficult to classify correctly.

Two parts may have similar overall dimensions while differing by one notch, opening, corner profile or local surface feature. Two pharmaceutical products may appear similar except for shape or physical size. Two molded components can share the same general outline while one contains a small missing feature.

The Machine Vision Lens should therefore provide enough native spatial detail on the minimum differentiating feature used by the sorting algorithm.

Number of Objects per Image Changes Resolution per Object

A major distinction between an optical sorting machine and a conventional single-part inspection station is object density.

If one image contains twenty products, the sensor resolution is distributed across the entire sorting field rather than concentrated on one object.

Increasing the number of products captured simultaneously can improve throughput, but it can also reduce the number of pixels available per product.

OEMs should therefore evaluate the smallest object under the maximum expected product density rather than validating the lens with one isolated object.

Multi-Lane Sorting Machines Need FOV Allocation Across Every Lane

Many automatic sorting machines use several parallel lanes.

The camera may need to cover all lanes simultaneously or several cameras may divide them into groups.

If one camera covers multiple lanes, the total belt width, lane spacing and lateral object variation must be included in the physical FOV. The OEM should then calculate whether enough native resolution remains on the smallest object in the outermost lane.

Where one extremely wide view reduces detail too far, dividing the sorter into several optical zones can provide stronger results.

A 16 MM 10 MP Lens Can Support Wider Sorting Views

For compatible 2/3" camera systems, the Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides 16 mm focal length, 10 MP resolution, C-mount, 2/3" image format and an F2.8–16 aperture range. Kyptec Automation® describes the model for high-resolution industrial inspection and high-speed measurement applications.

This type of focal-length class can be evaluated where a sorter requires a comparatively broad physical field, such as multiple small-product lanes or a wider conveyor section. Final suitability should still be based on sensor dimensions, camera position and the smallest classification feature.

A 25 MM 10 MP Lens Can Support More Controlled Sorting Zones

For a sorter with controlled feeding or a narrower imaging region, the Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a verified 25 mm focal length, 10 MP resolution, C-mount, 2/3" format and F2.8–16 aperture range.

A medium focal-length configuration can be evaluated where individual products should occupy a larger percentage of the sensor. This can be particularly useful in component sorting machines, pharmaceutical product sorting systems and feeders where the physical inspection zone is smaller than a broad belt sorter.

Focal Length Should Follow FOV and Working Distance

It is incorrect to say that one focal length is universally best for optical sorting.

An 8 mm or 16 mm lens can create a wide field in one machine geometry, while a 25 mm, 35 mm or 50 mm lens can produce the correct field from another camera position.

The correct focal length depends jointly on sensor dimensions, required physical FOV and working distance.

OEMs should therefore first establish the actual camera mounting envelope and sorting width and then choose the focal length that satisfies both.

Working Distance Is Often Controlled by the Sorter Architecture

Optical sorting machines can contain conveyors, feeders, chutes, reject mechanisms, air-ejection assemblies, guides and protective enclosures.

These mechanical elements may determine how close the camera can be mounted.

A lens that gives the desired FOV only when positioned too close to the transport system may not be practical.

The available working distance should therefore be treated as an input to optical design rather than something adjusted after the lens has already been purchased.

A 35 MM Lens Can Be Useful When More Camera Stand-Off Is Required

For compatible 2/3" systems, the Kyptec Automation® KL-1230 35 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides 35 mm focal length, 10 MP resolution, C-mount, 2/3" format and an F2.8–16 aperture range.

This focal-length class can be evaluated when sorting-machine mechanics require greater camera stand-off while the resulting FOV remains compatible with the product width and required pixels per object.

The important point is not that 35 mm is inherently better than 16 mm or 25 mm, but that it offers another optical geometry for OEMs working within different machine layouts.

High-Resolution Sorting Becomes Important When Wide FOV and Small Objects Must Coexist

A common optical-sorting problem is a wide inspection field combined with very small products or small classification features.

For compatible larger-format high-resolution systems, the Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a 25 mm focal length, 25 MP resolution class, C-mount and F2.8–22 aperture range according to the current product page.

A higher-resolution configuration can be attractive when many objects must remain inside one image while smaller classification features still need substantial native sampling.

25 MP Does Not Automatically Produce Better Sorting

Higher megapixel resolution only helps when the additional sensor pixels actually increase the number of pixels available on the object.

If a higher-resolution system is simultaneously used to inspect a much larger physical field, the practical gain can be smaller than expected.

The meaningful comparison is therefore pixels per object and pixels per minimum feature, not megapixels alone.

Machine builders should calculate object-side sampling for every proposed camera-lens configuration before deciding between 5 MP, 10 MP and 25 MP optical systems.

Optical Sorting by Size Requires Stable Product Edges

Sorting machines that classify products by length, width or diameter depend on stable product boundaries.

The Machine Vision Lens should maintain useful edge definition across the full sorting area, including outer lanes and positions away from the image center.

If edge quality varies substantially across the field, the measured product dimensions can become dependent on lateral position.

This is particularly important when size thresholds between acceptable sorting categories are relatively small.

Shape Sorting Requires Enough Resolution on the Distinguishing Contour

Two products may have similar width and length but different profiles.

One may contain a tab, notch, flat section, opening or asymmetrical edge.

A machine vision lens for shape sorting should therefore preserve the contour feature that actually distinguishes the objects.

Increasing total camera resolution is useful only if the final FOV places enough of those pixels on that physical contour.

Orientation Sorting Requires a Directional Product Feature

Optical sorting machines often need to distinguish correctly oriented and incorrectly oriented products.

The vision system may identify a notch, flat edge, opening or other asymmetric feature to calculate orientation.

The Machine Vision Lens should therefore resolve that directional feature reliably even when the product appears in different areas of the belt or feeder.

Where objects rotate freely, the inspection should be validated across the full expected angular range.

Position Detection Matters for Downstream Rejection or Handling

Some sorting systems do more than classify product quality.

They must also determine where the product is located so that a reject mechanism, robot or diverter can act on it.

The optical system should therefore provide consistent positional imaging across the full usable field.

A product that moves from the center to the edge of the sorter should remain sufficiently resolved for both classification and coordinate estimation.

Optical Sorting of Small Industrial Components Needs High Pixels per Object

Small component sorting machines may inspect clips, molded parts, electronic components, fasteners, miniature assemblies or other mass-produced objects.

In these systems, overall sorter width can easily become much larger than the individual product.

A tighter controlled FOV, suitable sensor resolution or multiple cameras may be necessary to maintain sufficient pixels on each component.

This is where the multiple focal lengths and resolution classes in the Kyptec Automation® Machine Vision Lens portfolio give OEMs useful design flexibility.

Food and Beverage Sorting Machines Often Require Broad Coverage

Food and beverage processing is one of the major application areas listed for Kyptec Automation® Machine Vision Lenses.

Relevant machine examples can include food grading machines, produce sorting systems, confectionery sorting machines, processed-food inspection machines and general high-speed product classification systems.

From a lens-selection perspective, the important questions remain sorting width, number of products in the image, smallest visible classification feature and camera working distance.

The blog should not assume that every food sorter has the same optical geometry; the Machine Vision Lens should be selected from the actual machine specification.

Pharmaceutical Sorting Machines Need Fine Product-Level Resolution

Pharmaceutical is also explicitly listed among Kyptec Automation® application areas.

Machine examples can include tablet sorting machines, capsule classification machines, pharmaceutical component sorting systems and automated product grading stations.

These applications often involve comparatively small objects, meaning that a large sorting field can quickly reduce pixels per product.

A high-resolution lens-camera combination can therefore be evaluated where several small pharmaceutical products must remain visible simultaneously.

Electronic Component Sorting Machines Can Require Tight High-Detail Fields

Electronics is another application area listed on current Kyptec Automation® Machine Vision Lens pages.

Relevant OEM machines include electronic component sorting machines, terminal sorting systems, molded electrical-part graders and miniature component classification machines.

Here, the challenge is frequently small object size combined with high product count.

Medium or longer focal-length lenses can be evaluated where controlled presentation allows a smaller field and greater pixels per object.

Plastic and Molded-Part Sorting Machines Need Shape and Defect Visibility

General industrial sorting systems may classify molded plastic components by size, shape, orientation or visible manufacturing condition.

The lens should preserve both the overall contour and any small local feature used to separate acceptable and rejected products.

Where the sorter processes several product families, OEMs should check every family independently because the largest object and smallest critical feature may belong to different products.

Multi-Camera Optical Sorters Can Divide a Wide Belt Into Higher-Resolution Zones

One camera does not always need to cover the entire sorting machine.

A wide belt can be divided into two, three or more optical zones, each with a smaller FOV.

This increases pixels per millimetre for a given sensor resolution and can make small-object classification more reliable.

The correct decision depends on whether the additional camera complexity provides enough improvement in native image sampling to justify the architecture.

Different Cameras in One Sorter Can Use Different Focal Lengths

A machine may use one camera for broad object detection and another for localized high-detail classification.

The two cameras do not necessarily need identical Machine Vision Lenses.

For example, a broad 16 mm view and a tighter 25 mm or 35 mm view can be technically valid when their FOV and working-distance requirements differ.

The Kyptec Automation® portfolio provides several focal-length options across multiple resolution classes, allowing individual stations to be optimized rather than forcing every camera into one configuration.

Localized High-Detail Sorting Can Use a 50 MM 25 MP Lens

For compatible larger-format systems, the Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides 50 mm focal length, 25 MP resolution class, C-mount and an F2.8–22 aperture range.

This type of configuration can be evaluated for localized sorting stations where a comparatively small object region or classification feature should occupy a greater proportion of the sensor from increased stand-off.

It can also be useful as a secondary high-detail camera in a larger sorting platform.

High Sorting Speed Requires the Lens to Perform Under Production Exposure Conditions

A sorter operating at production speed does not provide unlimited exposure time.

If product movement creates blurred edges, classification by size, shape or orientation can become less stable.

The Machine Vision Lens should therefore be evaluated under the actual aperture and exposure conditions used by the machine.

Kyptec Automation® describes its conventional Machine Vision Lenses as supporting reliable performance in high-speed inspection and measurement applications, making this production-speed validation directly relevant.

Depth of Field Matters When Objects Have Different Heights

Sorting systems may process products of different thicknesses or objects that do not remain at exactly the same height.

The focus setting and aperture should therefore maintain useful sharpness across the legitimate product-height range.

If one product type sits significantly closer to the camera than another, both image scale and focus can change.

The final optical design should be validated using the minimum and maximum product heights expected in production.

Overlapping Products Can Limit Optical Sorting Accuracy

If one product physically covers part of another, the hidden geometry cannot be recovered simply by increasing camera or lens resolution.

Mechanical singulation, feeder control or adequate product spacing can therefore be essential when complete shape information is required.

This is especially important in high-density optical sorting systems where increasing throughput by packing more objects into the FOV can eventually reduce both visibility and pixels per product.

Machine Examples Where Kyptec Automation® Machine Vision Lenses Can Be Used

Relevant OEM equipment includes industrial optical sorting machines, high-speed component sorting machines, food grading machines, tablet and capsule sorting machines, electronic component sorting machines, plastic-part sorting systems, automated shape-sorting machines, multi-lane classification machines, conveyor-based grading systems and special-purpose automatic sorting equipment.

The advantage of the Kyptec Automation® range is that these machines do not all require the same optical geometry. Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens can be evaluated for broader compatible fields, Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens can support controlled medium-field applications, Kyptec Automation® KL-1230 35 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens can suit increased stand-off requirements, while Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens and Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provide high-resolution choices for compatible systems requiring greater native sampling.

Why Kyptec Automation® Is a Strong Choice for Optical Sorting Machine OEMs

Kyptec Automation® provides a broad Machine Vision Lens portfolio covering multiple conventional focal lengths, resolution classes and sensor formats. This is valuable to sorting-machine OEMs because optical sorting platforms range from compact component sorters to wide multi-lane inspection machines, and one focal length cannot efficiently address every application.

The current Kyptec Automation® lens pages describe the products for industrial automation, high-speed inspection, defect detection, quality control and dimensional analysis, while applications include food and beverage processing, pharmaceutical, electronics and special-purpose machines.

This combination makes Kyptec Automation® a particularly practical choice for OEMs that want to select Machine Vision Lenses according to real sorting width, camera sensor format, minimum feature size and machine working distance rather than relying on one generic optical configuration.

Frequently Asked Questions About Machine Vision Lenses for Optical Sorting Machines

1. What is the best Machine Vision Lens for an optical sorting machine?

There is no universal best focal length because the correct choice depends on sorting width, sensor format, smallest object, minimum classification feature and camera working distance. Kyptec Automation® offers multiple focal lengths across 5 MP, 10 MP and 25 MP conventional Machine Vision Lens families, allowing an OEM to calculate the lens around the actual sorter geometry rather than select optics from focal length alone.

2. How do I calculate the FOV for an optical sorting machine?

Start with the total physical sorting width and height that objects can occupy, then add only the margin required for legitimate movement. The camera sensor size, working distance and Machine Vision Lens focal length should produce this FOV. Once the field is established, calculate pixels per millimetre to verify that the smallest sorting feature remains adequately represented.

3. How much resolution is needed for high-speed optical sorting?

Resolution depends on the smallest feature that separates one product class from another. A large object may require relatively modest sampling if classification depends only on overall size, while a small notch or edge difference can require much higher pixels per millimetre. Resolution should therefore be determined from the minimum classification feature rather than total product dimensions.

4. Is a 16 mm Machine Vision Lens suitable for a sorting machine?

It can be suitable where a comparatively broad field is required. Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a verified 16 mm, 10 MP, C-mount option for compatible 2/3" cameras. Final suitability depends on the sorter width, working distance and required object-side resolution.

5. When should a 25 mm Machine Vision Lens be considered for optical sorting?

A 25 mm focal length can be useful when the sorting region can be framed more tightly so objects occupy a greater percentage of the sensor. Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens is a current 10 MP option for compatible 2/3" systems.

6. When is a 25 MP Machine Vision Lens useful in a sorting machine?

A 25 MP lens-camera configuration can be useful where a broad field contains many small objects or where small classification features must remain well sampled. Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a verified high-resolution option for compatible larger-format systems.

7. Can one camera inspect several sorting lanes simultaneously?

Yes, provided all lanes fit inside the physical FOV and the smallest object in every lane still receives enough native sensor pixels. If one camera must cover an extremely wide multi-lane field, dividing the sorter between multiple cameras can sometimes provide substantially better pixels per millimetre.

8. Can optical sorting machines classify parts by shape?

Yes. The system can analyze product contour, notches, tabs, openings and other visible geometric differences. The Machine Vision Lens should provide sufficient native resolution on the smallest contour feature that distinguishes one sorting class from another.

9. Can optical sorting machines determine product orientation?

Yes, when the product contains a visible directional feature or asymmetric geometry. The system can identify the relevant feature and calculate rotational orientation. The lens should resolve that feature reliably across the complete valid sorting area.

10. Does working distance affect an optical sorting machine?

Yes. Working distance, sensor size and focal length jointly determine physical FOV and image scale. The camera location should therefore be established from actual sorter mechanics before final lens selection. A lens should not be chosen in isolation from available mounting space.

11. When should a 35 mm Machine Vision Lens be used in a sorter?

A 35 mm focal-length class can be considered when the camera needs greater stand-off while maintaining a controlled field. Kyptec Automation® KL-1230 35 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens provides a verified 10 MP, 2/3" option for compatible systems.

12. Can Machine Vision Lenses be used in food sorting and grading machines?

Yes. Food and beverage processing is explicitly listed among the major applications on Kyptec Automation® Machine Vision Lens pages. The correct focal length and resolution still depend on belt width, product dimensions, object density, camera location and the minimum visual feature required for sorting.

13. Can Machine Vision Lenses be used in pharmaceutical sorting machines?

Yes. Pharmaceutical is also listed among Kyptec Automation® Machine Vision Lens applications. Small pharmaceutical products can make native object resolution particularly important, especially when many tablets, capsules or components appear inside one image simultaneously.

14. Can Machine Vision Lenses be used for electronic component sorting?

Yes. Electronics is listed among the current application areas for Kyptec Automation® Machine Vision Lenses. Small electronic components often benefit from controlled FOV and high native resolution because the distinguishing product feature can be much smaller than the overall sorting zone.

15. Can a 50 mm Machine Vision Lens be used in an optical sorting machine?

Yes, particularly for localized high-detail inspection or a secondary camera positioned farther from the object. Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens provides a verified 50 mm, 25 MP, C-mount option for compatible larger-format systems.

16. Can increasing camera megapixels compensate for an excessively wide FOV?

Only to a point. Increasing native sensor resolution can add pixels across the field, but the system should still calculate pixels per millimetre and pixels per minimum classification feature. An unnecessarily large physical field wastes sensor resolution regardless of camera megapixel count.

17. What information should I provide before buying a Machine Vision Lens for an optical sorting machine?

Provide the total sorting width and height, smallest and largest object dimensions, minimum feature used for classification, maximum number of products visible simultaneously, number of lanes, camera sensor size and resolution, available working distance, product speed, product-height variation and whether one or multiple camera views will be used. These parameters allow a Kyptec Automation® Machine Vision Lens to be selected according to the actual optical sorting requirement rather than focal length alone.

Build Optical Sorting Machines Around FOV, Pixels per Object and Working Distance

A reliable optical sorting machine should be designed around the complete relationship between sorting width, camera resolution, object density, minimum classification feature and available working distance. The objective is not simply to capture every object on the belt; each product must remain sufficiently resolved for the size, shape, orientation, defect or geometric feature that determines its sorting category.

OEMs should first define the smallest required sorting feature and total physical sorting area, then calculate pixels per millimetre and pixels per object. Camera position and working distance should be established from actual machine mechanics, after which focal length and sensor format can be selected. Where a broad field reduces resolution too far, higher-resolution optics or several smaller camera zones can provide a stronger architecture than one excessively wide image.

Kyptec Automation® offers a broad Machine Vision Lens portfolio across conventional 5 MP, 10 MP and 25 MP resolution classes and multiple focal lengths. Relevant verified examples include Kyptec Automation® KL-1226 16 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens for broader compatible sorting fields, Kyptec Automation® KL-1228 25 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens for controlled medium-field inspection, Kyptec Automation® KL-1230 35 MM Machine Vision Lens With 10 MegaPixel & 2/3" Format Lens for greater stand-off, Kyptec Automation® KL-1240 25 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens for high-resolution compatible systems and Kyptec Automation® KL-1244 50 MM Machine Vision Lens With 25 MegaPixel & 1.1" Format Lens for localized high-detail sorting.

For industrial optical sorting machines, food grading systems, pharmaceutical sorting machines, electronic component sorters, plastic-part classification machines and other high-speed automatic sorting equipment, this range makes Kyptec Automation® a strong practical choice for matching Machine Vision Lens focal length, resolution and sensor format to the actual sorting architecture.