35mm 2/3-Inch 10MP Fixed-Focal C-Mount Machine Vision FA Lens

35mm 10MP Fixed-Focal C-Mount Lens for 2/3-Inch Cameras

The POMEAS PMS-LFEHH-3520M(D) is a 35mm fixed-focal FA lens designed for C-mount machine vision cameras with sensors up to 2/3 inch. It is rated for 10MP imaging and features an F2.0-F22 manual iris, a focusing range from 0.2 m to infinity, and separate locking mechanisms for focus and aperture adjustment.

The 35mm focal length provides a relatively narrow field of view compared with shorter focal-length lenses used on the same camera and at the same working distance. This allows more of the camera’s available pixels to be concentrated on a smaller inspection region.

The lens is suitable for component inspection, label and character reading, assembly verification, part-position checks, and detailed surface inspection where wide-area coverage is not required.

Key Features

10MP Resolution Rating

The PMS-LFEHH-3520M(D) is rated for 10MP machine vision imaging.

This makes it suitable for detailed industrial inspection when matched with an appropriate sensor size and field of view. However, megapixel count alone does not confirm lens compatibility.

Camera pixel size, active sensor dimensions, required field of view, and the smallest feature to be detected should also be evaluated before final selection.

Supports Sensors up to 2/3 Inch

The lens is specified for camera sensors up to 2/3 inch, with an active image size of 11 mm.

It may also be used with smaller sensor formats, including compatible 1/2-inch cameras. A smaller sensor captures a smaller central portion of the image and therefore produces a narrower field of view at the same working distance.

Sensors larger than 2/3 inch should not be used unless POMEAS confirms image-circle coverage and acceptable image quality toward the sensor edges.

35mm Focal Length for Concentrated Inspection

The 35mm focal length provides a narrower inspection area than shorter 16mm or 25mm lenses used with the same sensor and working distance.

This can help:

• Place more camera pixels across a small component
• Reduce unnecessary background around the inspection target
• Inspect individual labels, connectors, terminals, holes, and edges
• Maintain a longer 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 cannot fit into the 35mm field of view.

F2.0-F22 Manual Iris

The adjustable F2.0-F22 iris allows the system integrator to balance image brightness, camera 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 setting should be selected together with the camera exposure, object speed, and lighting intensity.

0.2 m to Infinity Focusing Range

The published focusing range begins at 0.2 m and extends to infinity.

This allows the lens to be used in inspection systems with moderate or longer installation distances. The exact mechanical reference point used for the focusing distance should be confirmed when camera placement and installation clearance are tightly controlled.

The focusing range should not be treated as a guaranteed working distance measured from the front surface of the lens.

Lockable Focus and Iris Adjustments

The focus and iris adjustments include manual locking mechanisms.

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

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

Low-Distortion Optical Design

The supplied product sheet describes the lens as providing low-distortion imaging and uniform illumination from the center toward the edge.

These design characteristics are relevant for edge detection, part localization, label inspection, and geometry-related vision tasks.

However, the product sheet does not provide a numerical distortion value or relative-illumination curve. Measurement applications should therefore be calibrated and validated using the complete camera and lens system.

Compact C-Mount Construction

The lens uses a C-mount interface. The dimension drawing shows a lens barrel diameter of Ø30 mm, a mount base diameter of Ø31.80 mm, and a lens body length of 38.43 mm.

The compact structure can help reduce mechanical interference with camera brackets, lighting systems, protective covers, and nearby automation components.

Clearance around the focus and iris locking screws should still be checked before installation.

Technical Specifications

Model: PMS-LFEHH-3520M(D)
Lens Type: Fixed focal machine vision FA lens
Resolution Rating: 10MP
Focal Length: 35 mm
Maximum Sensor Format: 2/3 inch
Active Image Size: 11 mm
Aperture Range: F2.0-F22
Focusing Range: 0.2 m to infinity
Camera Mount: C-Mount
Filter Thread: M30.5 × 0.5 mm
Focus Adjustment: Manual, with locking mechanism
Iris Adjustment: Manual, with locking mechanism
Operating Temperature: -10°C to +50°C
Lens Barrel Diameter: Ø30 mm
Mount Base Diameter: Ø31.80 mm
Lens Body Length Shown in Drawing: 38.43 mm

Angle of View

2/3-Inch Sensor

Diagonal: 17.88°
Horizontal: 14.35°
Vertical: 10.8°

1/2-Inch Sensor

Diagonal: 13.1°
Horizontal: 10.47°
Vertical: 7.86°

At the same working distance, the 1/2-inch sensor captures a narrower scene because it uses a smaller central portion of the lens image.

Camera and Sensor Compatibility

The PMS-LFEHH-3520M(D) is designed for C-mount machine vision cameras with sensors up to 2/3 inch.

It may also be used with smaller compatible sensors. Before confirming compatibility, check:

• Camera model
• Active sensor width and height
• Sensor optical format
• Camera resolution
• Pixel size
• C-mount interface
• Flange and adapter configuration
• Camera housing dimensions
• Clearance around the locking mechanisms
• Filter or protective-window requirements
• Illumination wavelength

The 10MP rating does not guarantee compatibility with every 10MP camera. Cameras with smaller pixels can place higher resolving demands on the lens than cameras with larger pixels and the same total resolution.

A sensor larger than 2/3 inch should not be used unless image-circle coverage and edge image quality have been confirmed.

Field of View and Working Distance Guidance

The actual field of view depends on:

• Lens focal length
• Active camera sensor dimensions
• Working distance
• Camera 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 35mm lens captures a narrower scene than a 25mm or 16mm lens.
• A larger sensor captures a wider scene than a smaller sensor.
• A narrower field of view places more camera pixels across the inspection target.

The product sheet provides angular field-of-view values but does not provide verified linear field-of-view dimensions in millimeters.

To confirm the actual field of view, provide POMEAS with:

• Camera model
• Active sensor dimensions
• Camera resolution
• Pixel size
• Available working distance
• Required horizontal field of view
• Required vertical field of view
• Smallest inspection feature
• Required inspection accuracy

Recommended Applications

Electronic Component and Connector Inspection

The 35mm focal length can concentrate camera pixels on connectors, terminals, switches, small components, solder areas, and selected PCB regions.

It is suitable when a shorter focal-length lens captures more surrounding area than the inspection requires.

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

Label, Barcode, and Character Inspection

The lens can support inspection of serial numbers, labels, printed characters, date codes, and machine-readable codes.

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

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

Assembly and Part-Presence Verification

The PMS-LFEHH-3520M(D) may be used to inspect fasteners, clips, connectors, seals, inserted parts, and defined assembly positions.

The locking mechanisms help maintain focus and aperture settings after equipment setup.

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

Part Positioning and Edge Detection

The concentrated field of view can support detection of holes, edges, reference marks, component positions, and orientation features.

Application boundary: The supplied sheet does not provide numerical distortion data or guaranteed positioning accuracy. Camera calibration is required for coordinate-based inspection.

Surface Inspection of Small Areas

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

Application boundary: The lens does not create defect contrast by itself. Lighting type, angle, wavelength, and intensity must be selected according to the surface and defect characteristics.

Selection Notes

Choose This 35mm Model When

• The camera sensor is 2/3 inch or smaller
• A 10MP lens rating is required
• The camera uses a C-mount interface
• A narrow inspection area is required
• A 25mm lens captures more area than necessary
• More camera pixels are needed on a small target
• The camera must remain farther from the object
• Manual focus and iris locking are required
• The available focusing condition is 0.2 m or greater

Choose a Shorter Focal Length When

• A larger object area must fit into one image
• Several components must be inspected simultaneously
• The available camera distance is limited
• The 35mm field of view is too narrow
• A wide conveyor, tray, or packaging area must be covered
• Pixel concentration on small features is less important

Choose a Longer Focal Length When

• The inspection region is even smaller
• More camera pixels are required on a very small feature
• The camera can be installed farther from the object
• The target occupies only a small portion of the 35mm image

Availability of a longer focal-length model should be confirmed with POMEAS.

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-defect inspection
• Component-position checks
• General edge detection
• Part localization
• Packaging inspection

When to Consider a Telecentric Lens

Consider a telecentric lens when:

• Dimensional measurement accuracy is the primary objective
• Object height changes during inspection
• Magnification must remain stable across different depths
• Perspective error cannot be accepted
• Edge position must remain consistent
• Measurement tolerance is too strict for a conventional FA lens

When This Lens May Not Be Suitable

The PMS-LFEHH-3520M(D) may not be suitable when:

• The camera sensor is larger than 2/3 inch
• The camera does not use a compatible C-mount interface
• The required field of view is wider than the 35mm lens provides
• The required focusing condition is shorter than 0.2 m
• High-accuracy dimensional measurement is required without calibration
• Object-height variation causes unacceptable perspective changes
• Numerical distortion data is required before system design
• Spectral performance or wavelength range must be guaranteed
• Motorized focus or motorized iris control is required

FAQ

Can the PMS-LFEHH-3520M(D) be used with a 2/3-inch camera?

Yes. The lens is specified for sensors up to 2/3 inch with an active image size of 11 mm. The camera must also use a compatible C-mount interface.

Can it be used with a 1/2-inch sensor?

Yes. The product sheet provides angle-of-view data for 1/2-inch sensors. The smaller sensor captures a narrower field of view than a 2/3-inch sensor at the same working distance.

Does this lens work with every 10MP camera?

Not automatically. Camera sensor size and pixel pitch vary between models. Active sensor dimensions, pixel size, required field of view, and the smallest inspection feature must be checked.

What field of view will the 35mm lens provide?

The exact field of view in millimeters depends on the camera sensor dimensions and working distance. Provide both values to POMEAS for calculation or testing.

How does the 35mm lens differ from a 25mm lens?

At the same sensor size and working distance, the 35mm lens provides a narrower field of view and places more camera pixels across a smaller inspection area. The 25mm lens is more suitable when wider coverage is required.

Is the PMS-LFEHH-3520M(D) 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 supplied sheet does not provide a numerical distortion value or guaranteed measurement accuracy. A telecentric lens may be more suitable for strict metrology.

Does the lens support custom configurations?

Customization is not confirmed in the supplied product sheet. Provide the required mount, field of view, working distance, wavelength, mechanical dimensions, or other special requirements to POMEAS for technical confirmation.

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

POMEAS will review sensor coverage, expected field of view, object-side pixel resolution, mechanical compatibility, and application conditions before recommending the final lens configuration.