35mm 20MP 1.1-Inch C-Mount FA Machine Vision Lens

Designed for Clear, Stable Industrial Imaging

A machine vision lens must do more than produce a sharp image during initial setup. It must also hold its optical settings during repeated production cycles. The PMS-LFHHG-3520M(B) uses separate focus and iris locking screws to reduce unintended adjustment after the image has been tuned.

• 35mm focal length: suitable for medium-field inspection where a narrower view or longer installation distance is preferred over a shorter focal-length lens.
• F2.0-F22 manual iris: balances image brightness, exposure time and depth of field for different lighting conditions.
• Low-distortion imaging: distortion is specified as low as -0.12% on a 1/2-inch format and -0.52% across the listed 4/3-inch image circle.
• 420-1000nm spectral range: supports visible and near-infrared machine vision configurations, subject to camera and lighting compatibility.

Camera and Sensor Compatibility

The specification table lists a maximum image sensor size of 4/3 inch (23mm), while the product overview states support for up to 20MP 1.1-inch cameras. This makes the lens a practical option for high-resolution 1.1-inch systems that also require a larger image circle.

Important selection note: when using a full 4/3-inch high-resolution sensor, confirm edge resolution, illumination and mechanical compatibility with the exact camera model before production approval. The uploaded datasheet does not explicitly rate 20MP performance across every 4/3-inch sensor.

Field Angle and Object Size Reference

Actual field of view changes with sensor dimensions and working distance. For project selection, calculate the required horizontal and vertical field of view using the real camera sensor rather than relying only on the nominal sensor format.

Typical Machine Vision Applications

• PCB, connector and electronic component inspection
• Surface defect and appearance inspection
• Label, character and code recognition
• Precision metal and molded-part inspection
• Automated assembly positioning and presence checking
• Visible or near-infrared imaging within the stated spectral range

This is a conventional FA lens rather than a telecentric lens. For high-accuracy dimensional measurement where object height variation or perspective error must be minimized, consider a telecentric or application-specific machine vision lens.

Factory-Direct Optical and Application Support

POMEAS combines optical design, lens processing, mechanical machining, dust-free assembly, quality control and application support through its Dongguan manufacturing and R&D operation. For customers, this integrated capability helps reduce selection risk by connecting the lens specification with the actual camera, lighting, field-of-view and installation requirements.

Before ordering, POMEAS can review the camera model, sensor size, required field of view, working distance, object depth, inspection tolerance and available installation space. Sample imaging or project validation is recommended when edge resolution or dimensional accuracy is critical.

How to Select the Right Configuration

Please provide the following information:

1. Camera model, sensor dimensions, resolution and pixel size
2. Required horizontal and vertical field of view
3. Available working distance and installation space
4. Smallest defect, character or feature that must be resolved
5. Object height variation and required measurement tolerance
6. Lighting type and whether visible or near-infrared imaging is required

A shorter focal length generally provides a wider field of view at the same working distance, while a longer focal length provides a narrower view or allows a greater working distance for a similar field. Compare this 35mm model with the 25mm C-Mount machine vision lens and the 50mm C-Mount machine vision lens when evaluating system layout.

Key Specifications

• Model: PMS-LFHHG-3520M(B)
• Focal length: 35mm
• Mount: C-Mount
• Image sensor size: 4/3 inch (23mm)
• Resolution support: up to 20MP on 1.1-inch cameras
• Iris range: F2.0-F22
• Focusing range: 0.2m to infinity
• Back focal length: 18mm
• Spectral range: 420-1000nm
• Filter thread: M46 x P0.75
• Weight: 207g
• Operating temperature: -20°C to +60°C

Frequently Asked Questions

Can this 35mm lens be used with a 4/3-inch camera?

The datasheet lists a 4/3-inch image circle. However, the 20MP resolution statement specifically refers to 1.1-inch cameras, so edge performance on a high-resolution 4/3-inch sensor should be confirmed with the exact camera.

What field of view will the lens provide?

Field of view depends on the active sensor dimensions and working distance. At the minimum focusing distance, the datasheet lists an object size of 96.7 x 72.4mm for the horizontal and vertical dimensions on a 4/3-inch sensor.

Can the focus and iris be locked after setup?

Yes. The lens includes separate focus and iris locking screws to help maintain the selected settings in an industrial system.

Is this lens suitable for precision dimensional measurement?

It can support general visual inspection and measurement tasks, but it is not telecentric. For tight dimensional tolerances or objects with height variation, a telecentric lens is usually the safer choice.

What information is needed before selecting this lens?

Provide the camera model, sensor size, pixel size, field of view, working distance, smallest feature, accuracy requirement, lighting and installation space.

Related POMEAS Resources

• Browse machine vision lenses and imaging components
• Compare a 35mm lens for 2/3-inch 5MP cameras
• Compare a wider 25mm C-Mount FA lens
• Compare a longer 50mm C-Mount FA lens

Request Lens Selection Support

Send POMEAS your camera model, field of view, working distance and inspection target. The optical and application team can help verify whether the PMS-LFHHG-3520M(B) matches the required image coverage and resolution before you finalize the system configuration.