50mm 4/3-Inch 10MP C-Mount Inspection Lens | POMEAS

50mm 10MP C-Mount Inspection Lens for 4/3-Inch Cameras

The POMEAS PMS-LFHHH-5020M is a 50mm fixed focal FA lens designed for C-mount machine vision cameras with sensors up to 4/3 inch. It is rated for 10MP imaging and provides a Ø22 mm effective image circle, an adjustable F2.0-F22 manual iris, and lockable focus and aperture controls.

Compared with the 35mm model used on the same sensor and at the same working distance, the 50mm focal length provides a narrower field of view and places more camera pixels across a smaller inspection region. This makes it suitable for detailed component inspection, label and code reading, edge detection, assembly verification, and surface inspection where broad scene coverage is not required.

Published distortion values are provided for 4/3-inch, 1-inch, and 2/3-inch sensors, helping engineers evaluate the lens for calibrated positioning and geometry-sensitive inspection.

Key Features

Supports Sensors up to 4/3 Inch

The PMS-LFHHH-5020M supports machine vision cameras with sensors up to the specified 4/3-inch format.

Its Ø22 mm effective image circle provides the coverage required for the stated maximum sensor size. This makes it suitable for large-format C-mount cameras that cannot be fully covered by conventional lenses designed only for 1-inch or 2/3-inch sensors.

The lens may also be used with smaller compatible sensors. A smaller sensor captures a reduced central portion of the image circle and therefore produces a narrower field of view at the same working distance.

50mm Focal Length for Detailed Inspection

The 50mm focal length provides a more concentrated inspection area than 25mm or 35mm lenses used with the same camera and installation distance.

This can help:

• Place more camera pixels across a small component

• Reduce unnecessary background around the target

• Inspect individual labels, connectors, terminals, holes, and edges

• Maintain a greater camera-to-object distance for a selected field of view

• Improve feature visibility when a shorter focal length captures too much area

A shorter focal length should be selected when the complete object or inspection area cannot fit into the 50mm field of view.

10MP Resolution Rating

The lens is rated for 10MP machine vision imaging.

The megapixel rating should be evaluated together with the active sensor dimensions and pixel size. Cameras with the same megapixel count may use different sensor formats and pixel pitches, creating different optical resolution requirements.

Before confirming selection, review:

• Active sensor dimensions

• Camera pixel size

• Required horizontal and vertical field of view

• Smallest feature to detect

• Required inspection accuracy

Published Low-Distortion Performance

The product sheet specifies the following distortion values:

• 4/3-inch sensor: -0.14% at y = 11.0 mm

• 1-inch sensor: -0.05% at y = 8.0 mm

• 2/3-inch sensor: -0.02% at y = 5.5 mm

These values are relevant for edge detection, part localization, feature positioning, and calibrated image measurement.

The negative values indicate barrel-type geometric distortion at the stated image heights. Camera calibration and distortion correction should still be used when dimensional accuracy or coordinate positioning is required.

Published lens distortion is not equivalent to guaranteed system measurement accuracy.

Ø22 mm Effective Image Circle

The Ø22 mm effective image circle supports the specified 4/3-inch maximum sensor format.

Image-circle diameter is an important compatibility parameter when selecting a lens for a large-format camera. Insufficient image coverage may cause dark corners, incomplete sensor utilization, or reduced edge image quality.

The actual active sensor diagonal should still be confirmed because cameras using the same nominal optical-format name may have different active dimensions.

F2.0-F22 Adjustable Iris

The manual F2.0-F22 iris allows the system integrator to balance image brightness, exposure time, and depth of field.

Opening the iris allows more light to reach the sensor and may support shorter exposure times. Closing the iris can increase depth of field when the inspected object has moderate height variation, although stronger illumination may then be required.

The final aperture should be selected together with:

• Camera exposure time

• Object speed

• Illumination intensity

• Required depth of field

• Acceptable image sharpness

Lockable Focus and Iris Controls

The focus and iris adjustments include locking mechanisms.

After focus and aperture have been set, both controls can be secured to help reduce accidental movement during machine installation, camera handling, maintenance, or routine production operation.

This is useful for fixed inspection equipment that requires stable and repeatable imaging settings.

Sensor-Specific Angle-of-View Data

The product sheet provides complete diagonal, horizontal, and vertical angle-of-view values for three sensor formats.

For a 4/3-inch sensor:

• Diagonal: 25.9°

• Horizontal: 20.9°

• Vertical: 15.7°

For a 1-inch sensor:

• Diagonal: 18.2°

• Horizontal: 14.6°

• Vertical: 11.0°

For a 2/3-inch sensor:

• Diagonal: 12.6°

• Horizontal: 10.1°

• Vertical: 7.6°

These values show how the same 50mm lens produces different coverage when used with different sensor sizes.

Technical Specifications

Model: PMS-LFHHH-5020M
Lens Type: Fixed focal machine vision FA lens
Resolution Rating: 10MP
Focal Length: 50 mm
Maximum Sensor Format: 4/3 inch
Effective Image Circle: Ø22 mm
Aperture Range: F2.0-F22
Camera Mount: C-Mount
Filter Thread: M40.5 × 0.5 mm
Back Focal Length in Air: 20.29 mm
Focus Adjustment: Manual, with locking mechanism
Iris Adjustment: Manual, with locking mechanism
Operating Temperature: -10°C to +50°C

Angle of View

4/3-Inch Sensor

Diagonal: 25.9°
Horizontal: 20.9°
Vertical: 15.7°

1-Inch Sensor

Diagonal: 18.2°
Horizontal: 14.6°
Vertical: 11.0°

2/3-Inch Sensor

Diagonal: 12.6°
Horizontal: 10.1°
Vertical: 7.6°

A smaller sensor uses a smaller central portion of the image circle and therefore captures a narrower field of view.

Distortion

4/3-inch sensor: -0.14% at y = 11.0 mm
1-inch sensor: -0.05% at y = 8.0 mm
2/3-inch sensor: -0.02% at y = 5.5 mm

Applications involving dimensional inspection, coordinate positioning, or accurate edge measurement should include system calibration under the actual installation conditions.

Camera and Sensor Compatibility

The PMS-LFHHH-5020M is designed for C-mount machine vision cameras with sensors up to 4/3 inch.

It may also be used with compatible 1-inch and 2/3-inch cameras. When installed on a smaller sensor, the camera captures a narrower scene because it records a smaller area of the image circle.

Before confirming compatibility, check:

• Camera model

• Active sensor width and height

• Sensor diagonal

• Camera resolution

• Pixel size

• C-mount interface

• Flange and adapter configuration

• Camera housing dimensions

• Available installation space

• Filter requirements

• Illumination wavelength

The 10MP rating does not automatically guarantee compatibility with every 10MP camera. Cameras with smaller pixels may require greater optical resolving performance than cameras with larger pixels and the same total resolution.

The Ø48 mm housing and M40.5 filter thread should also be checked against nearby lighting, brackets, protective covers, and machine components.

Field of View and Working Distance Guidance

The actual linear field of view depends on:

• Lens focal length

• Active sensor dimensions

• Working distance

• Sensor aspect ratio

• Focusing position

For the same camera:

• Increasing the working distance increases the visible object area.

• Reducing the working distance decreases the visible object area.

• A 50mm lens captures a narrower scene than a 35mm or 25mm lens.

• A 4/3-inch sensor captures a wider scene than a 1-inch or 2/3-inch sensor.

• A narrower field of view places more camera pixels across the target.

The supplied product sheet does not provide a confirmed focusing range or linear field-of-view values at specific working distances.

To confirm the actual inspection area, provide POMEAS with:

• Camera model

• Active sensor size

• Camera resolution

• Pixel size

• Available working distance

• Required horizontal field of view

• Required vertical field of view

• Smallest inspection feature

• Required accuracy

POMEAS can then evaluate the expected field of view, image-circle coverage, and object-side pixel resolution.

Recommended Applications

Electronic Component and Connector Inspection

The 50mm focal length can concentrate camera pixels on connectors, terminals, switches, electronic components, solder areas, and selected PCB regions.

Compared with a shorter focal-length lens, it captures less surrounding area and provides more pixel coverage across the defined inspection target.

Application boundary: Very small solder defects, fine circuit traces, and microscopic features must be evaluated using the actual field of view and object-side pixel resolution.

Label, Barcode, and Character Inspection

The lens may be used for serial numbers, labels, printed characters, date codes, and machine-readable codes.

Its narrow field of view can provide more pixels across a label or code than a shorter focal-length lens when the camera position remains unchanged.

Application boundary: Barcode module size, character height, conveyor speed, exposure time, and illumination must be confirmed before readability can be guaranteed.

Assembly and Part-Presence Verification

The PMS-LFHHH-5020M can support inspection of individual fasteners, clips, seals, connectors, inserted components, and defined assembly positions.

The locking controls help maintain the selected focus and aperture settings after equipment setup.

Application boundary: A shorter focal length may be required when several widely separated inspection regions must fit into one image.

Part Positioning and Edge Detection

The published distortion data makes the lens relevant for detecting edges, holes, marks, reference features, and part orientation.

Application boundary: Coordinate-based inspection still requires calibration. Object-height changes can alter apparent position and magnification when using a conventional FA lens.

Surface Inspection of Small Areas

With suitable illumination, the lens may support inspection of scratches, contamination, missing material, print defects, and visible surface anomalies within a small defined area.

Application boundary: Lighting type, direction, wavelength, and intensity must be selected according to the material and defect. The lens alone does not create defect contrast.

Selection Notes

Choose This 50mm Model When

• A 4/3-inch or smaller C-mount sensor is being used

• A Ø22 mm image circle is required

• A 10MP lens rating matches the camera requirement

• A narrow inspection area is needed

• A 35mm lens captures more area than necessary

• More camera pixels are required on a small feature

• Published low-distortion data is required for system evaluation

• The camera can be positioned farther from the object

• Manual focus and iris locking are preferred

Choose the 35mm Model When

• A wider object or assembly area must fit into one image

• Several nearby inspection features must be captured together

• The available camera distance is limited

• The 50mm field of view is too narrow

• More surrounding context is required in the image

Choose the 25mm, 16mm, or 12mm Model When

• A large object, tray, conveyor, or assembly must fit into one image

• Camera installation distance is limited

• Multiple products or widely spaced components must be inspected together

• Pixel concentration on small features is less important than scene coverage

When a Standard FA Lens Is Usually Sufficient

A conventional FA lens may be suitable for:

• Presence and absence inspection

• Label and code reading

• Assembly verification

• Surface inspection

• Component-position checks

• Part localization

• Edge detection

• Calibrated positioning

When to Consider a Telecentric Lens

A telecentric lens should be considered when:

• Dimensional measurement accuracy is the primary objective

• Object height changes during inspection

• Magnification must remain stable at different depths

• Perspective error cannot be accepted

• Edge position must remain consistent

• The required tolerance is too strict for a conventional FA lens

When This Lens May Not Be Suitable

The PMS-LFHHH-5020M may not be suitable when:

• The camera sensor is larger than the specified 4/3-inch format

• The camera does not use a compatible C-mount interface

• The required field of view is wider than the 50mm lens provides

• Several widely separated objects must fit into one image

• Strict dimensional measurement is required without calibration

• Object-height variation creates unacceptable perspective changes

• A confirmed minimum focusing distance is required before mechanical design

• Motorized focus or motorized iris control is required

• Spectral performance must be guaranteed for a specific wavelength

FAQ

Can the PMS-LFHHH-5020M be used with a 4/3-inch camera?

Yes. The lens is specified for sensors up to 4/3 inch and provides a Ø22 mm effective image circle. The camera must also use a compatible C-mount interface.

Can it be used with 1-inch or 2/3-inch sensors?

Yes. The product sheet provides angle-of-view and distortion data for both formats. Smaller sensors capture a narrower field of view at the same working distance.

What field of view will the 50mm lens provide?

The exact linear field of view depends on the active sensor dimensions and working distance. The product sheet provides angular coverage but does not provide object coverage in millimeters at specific distances.

How does this 50mm model differ from the 35mm model?

At the same sensor size and working distance, the 50mm lens provides a narrower field of view and places more camera pixels across a smaller inspection area. The 35mm model is more suitable when wider coverage is required.

Is the lens suitable for dimensional measurement?

It may be used in a calibrated system after the complete camera and lens setup has been validated against the required tolerance. The product sheet provides low distortion values, but it does not specify guaranteed measurement accuracy. A telecentric lens may be more appropriate for strict metrology.

Does the 10MP rating guarantee compatibility with every 10MP camera?

No. Camera sensor dimensions and pixel size vary between models. Sensor size, pixel pitch, required field of view, and the smallest inspection feature must be reviewed together.

What focusing distance does this lens support?

The supplied product sheet does not provide a confirmed focusing range. Submit the camera model, available working distance, and required field of view to POMEAS before completing the mechanical design.

Request Lens Selection Support

Please provide POMEAS with:

Camera model
Sensor size
Camera resolution
Pixel size
Available working distance
Required field of view
Inspection object
Smallest feature to detect
Accuracy requirement
Object height variation
Illumination method
Available installation space

POMEAS will review sensor coverage, image-circle compatibility, expected field of view, object-side pixel resolution, distortion requirements, and mechanical clearance before recommending the final lens configuration.