20mm 1 Inch 5MP C-Mount Machine Vision Lens

20mm 1 Inch 5MP C-Mount Machine Vision Lens

The POMEAS PMS-LFGH-2016(A) is a 20mm C-mount machine vision lens designed for industrial cameras with sensor formats up to 1 inch. It combines 5MP optical resolution, an adjustable F1.6-F22 manual iris and independent focus and iris locking screws in a compact industrial housing.

With a maximum supported sensor area of 12.8 × 9.6mm and a Ø16mm image circle, the lens can be paired with compatible 1-inch and smaller-format C-mount industrial cameras. Its fixed 20mm focal length is suitable for machine vision systems requiring a narrower field of view than common 8mm, 12mm or 16mm lenses.

Key Features

Supports Sensors up to 1 Inch

The lens supports industrial camera sensors up to 1 inch, with maximum sensor dimensions of 12.8 × 9.6mm.

It can also be used with smaller sensor formats, such as 2/3-inch cameras. When the same 20mm lens is used with a smaller sensor, the captured field of view becomes narrower.

5MP Optical Resolution

The PMS-LFGH-2016(A) is rated for machine vision cameras with resolutions up to 5 megapixels.

The lens is suitable for general industrial imaging tasks such as feature recognition, product inspection, positioning and production-line monitoring. Final image quality also depends on the camera pixel size, illumination, working distance and mechanical installation.

20mm Fixed Focal Length

The fixed 20mm focal length provides a relatively narrow viewing angle and higher object magnification than shorter focal length lenses used at the same working distance.

It is suitable for applications where the camera must be positioned farther from the target or where a wide-angle lens captures more surrounding area than required.

F1.6-F22 Manual Iris

The adjustable F1.6-F22 iris allows the operator to balance image brightness, exposure time and depth of field.

A wider aperture, such as F1.6, allows more light to reach the camera sensor and can support shorter exposure times. A smaller aperture can increase depth of field when the inspected object has height variation.

The aperture should not be closed more than necessary, because an excessively small aperture may reduce fine image detail.

Independent Focus and Iris Locks

The lens includes separate locking screws for the focus and iris adjustment rings.

After the required image sharpness and exposure settings have been confirmed, the locking screws can be tightened to reduce accidental adjustment and help maintain a stable imaging configuration during machine operation.

Standard C-Mount Interface

The standard C-mount interface enables integration with a wide range of compatible industrial cameras.

Before selecting the lens, confirm that the camera uses a C-mount interface and that its sensor size does not exceed the supported 1-inch image format.

Technical Specifications

Angular Field of View

The values above describe the angular field of view. The actual object-side field of view depends on the camera sensor dimensions and working distance.

For accurate lens selection, provide the required horizontal and vertical field of view rather than selecting a focal length based only on the object size.

Camera Compatibility

This 20mm C-mount machine vision lens can be used with compatible monochrome or color industrial cameras using sensor formats up to 1 inch.

Before ordering, confirm the following camera information:

• Sensor model
• Sensor size
• Sensor resolution
• Pixel size
• Lens mount
• Required field of view
• Available working distance

A camera having a C-mount interface does not automatically guarantee the correct field of view. Sensor dimensions and working distance must also be evaluated.

Working Distance

The specified focusing range is from 1 metre to infinity.

This makes the lens more appropriate for medium- and long-distance imaging than for close-range or macro inspection. For applications with a working distance shorter than 1 metre, a different fixed focal length lens, extension tube or close-focus optical solution may be required.

Distortion Considerations

The specified distortion is -1.82% at an image height of 8.0mm and -0.79% at an image height of 5.5mm.

For general recognition, presence detection and appearance inspection, distortion can often be managed through camera calibration or image-processing software.

For high-accuracy dimensional measurement, the complete measurement error budget should be evaluated. A lower-distortion or telecentric lens may be more appropriate when object dimensions must remain consistent across the entire field of view.

Typical Applications

The PMS-LFGH-1616(A) can be considered for applications such as:

• Automated visual inspection
• Product presence and absence detection
• Component positioning
• Assembly verification
• Industrial feature recognition
• Electronics production inspection
• Factory automation imaging
• Machine vision monitoring
• Character or label recognition
• General industrial image acquisition

Actual application suitability depends on the required field of view, working distance, inspection speed, target feature size, camera resolution and lighting arrangement.

Lens Selection Guidance

To determine whether this 20mm industrial camera lens is suitable, compare the required object field of view with the camera sensor dimensions and available working distance.

A 20mm lens generally produces a narrower field of view than a 12mm or 16mm lens when used with the same sensor and working distance. Increasing the working distance increases the field of view, while moving the lens closer to the object reduces it.

The final visible area should be confirmed through optical calculation or an actual imaging test before production installation.

Frequently Asked Questions

Is this lens compatible with a 1-inch industrial camera?

Yes. The lens supports sensor formats up to 1 inch, with a maximum sensor area of 12.8 × 9.6mm and a Ø16mm image circle.

The camera must also use a compatible C-mount interface.

Can it be used with a 2/3-inch sensor?

Yes. A 2/3-inch sensor is smaller than the maximum supported 1-inch format.

The specified angular field of view for a 2/3-inch sensor is 25.0° × 18.8°, compared with 35.8° × 27.2° for a 1-inch sensor.

Is this a zoom lens?

No. It is a fixed focal length machine vision lens with a focal length of 20mm.

The field of view is changed by adjusting the working distance, changing the camera sensor size or selecting another focal length.

Does the lens have a manual iris?

Yes. The manual iris can be adjusted from F1.6 to F22 and secured with an iris locking screw.

Is the lens suitable for short-distance inspection?

The specified focusing range begins at 1 metre. It is therefore not primarily intended for close-range or macro imaging.

Provide the required working distance and field of view before selection if the camera must be installed closer than 1 metre.

Can the lens be used for dimensional measurement?

It may be used after evaluating the complete system accuracy and performing calibration. However, standard fixed focal length lenses can introduce perspective and distortion errors.

For higher-accuracy measurement, a telecentric lens or a lower-distortion optical configuration may be more suitable.

Request a Lens Selection Evaluation

To confirm camera and lens compatibility, please provide:

• Camera model
• Sensor size
• Camera resolution and pixel size
• Required field of view
• Working distance
• Object dimensions
• Smallest feature to be detected
• Required inspection accuracy
• Available installation space
• Application description

POMEAS can evaluate the imaging configuration and recommend an appropriate machine vision lens for your industrial inspection system.

Model: PMS-LFGH-1616(A)
Focal Length: 20mm
Maximum Sensor Format: 1 Inch
Resolution: 5MP
Mount: C-Mount

Contact POMEAS for product drawings, camera compatibility checks and machine vision lens selection support.