40/150mm Uncooled LWIR Dual FOV Lens
F1.0/F1.2 Infrared Optics for 1024 × 768, 12 μm Detector Platforms
The IRLENS 40/150mm uncooled LWIR dual FOV lens combines two optical viewing positions for thermal cameras using a 1024 × 768 detector with 12 μm pixels. Operating in the 8–12 μm band, it pairs broader coverage at 40mm with a narrower observation view at 150mm.
For thermal camera OEMs, surveillance equipment manufacturers and system integrators, this configuration provides a defined optical starting point for camera development. Match the lens to your detector package, installation space and control requirements, then discuss sample evaluation and production quantities with IRLENS.
Explore our Uncooled LWIR Dual FOV Lenses to compare additional focal length combinations.
Request the Datasheet and OEM Volume Pricing
40/150mm Lens Specifications
| Parameter | Specification |
|---|---|
| Focal length pair | 40mm / 150mm |
| F-number | F1.0 at 40mm / F1.2 at 150mm |
| Reference detector format | 1024 × 768, uncooled |
| Detector pixel pitch | 12 μm |
| Working spectral band | 8–12 μm |
| Field of view at 40mm (H × V) | 17.46° × 13.14° |
| Field of view at 150mm (H × V) | 4.69° × 3.52° |
| Focal length ratio | 3.75:1 between two discrete positions |
| Exposed lens coating | AR coating; DLC and HD options available on request |
| Published imaging distance range | 5m to infinity |
| Operating temperature | −40°C to +60°C |
| Storage temperature | −40°C to +60°C |
| Front lens sealing | IP67 |
Field-of-view values apply to the reference detector format above. Confirm the focus range at each optical position, mechanical drawing, weight and control configuration during the technical review.
From Scene Coverage to Detailed Observation
40mm View for Locating Areas of Interest
Use the wider position when surrounding context matters: checking activity across a site, locating equipment within a scene or deciding where to direct closer observation. It gives operators more scene coverage on the reference detector before switching to the longer focal length.
150mm View for Closer Optical Examination
The longer focal length places a smaller scene area across the detector. For distant objects viewed with the same sensor, the linear image scale is approximately 3.75 times that at 40mm. This supports examination of objects or features that occupy fewer pixels in the wider view.
The two positions provide distinct optical views. Select this configuration when your camera requires repeatable overview and detail modes; use a continuous zoom design when usable intermediate focal lengths are required.
Integration with 12 μm Uncooled Detectors
A 40/150mm LWIR lens for a 1024 × 768 detector must be evaluated as part of the complete camera. Matching the nominal resolution and pixel pitch is the first step; the detector package, focal plane position and lens interface must also fit the design.
During evaluation, review:
Image quality across the sensor: assess center and edge performance in both viewing positions.
Image circle coverage: check the active sensor area for shading or vignetting.
Focus and alignment: define acceptable focus variation and optical-axis movement when changing FOV.
Camera window: include its material, thickness and position in the optical review.
For a different detector format, request a compatibility review and revised FOV assessment before selecting the lens for production.
Coatings and Environmental Integration
The AR-coated exposed lens surface supports infrared transmission. DLC and HD coating options can be discussed for the intended exposure, cleaning process and optical requirements.
IP67 applies to the front lens seal. The camera enclosure, rear mounting interface and electrical connections need their own protection design. Include shock, vibration and temperature cycling requirements in the project specification so an appropriate evaluation plan can be agreed.
Applications for Professional Thermal Camera Systems
Perimeter monitoring: retain scene context while surveying a site, then examine an area of interest through the narrow view.
Industrial site observation: monitor equipment, storage areas or infrastructure with two defined optical coverage modes.
Vehicle-mounted observation: evaluate the lens for a thermal camera installation with suitable mounting space and environmental protection.
For projects with a specified detection or recognition distance, provide target dimensions, expected thermal contrast and operating conditions. Observation range depends on the complete imaging system and should be evaluated against the required task.
OEM Configuration and Production Qualification
IRLENS provides custom infrared lens design and manufacturing services for camera developers who require an adapted optical or mechanical configuration.
Send your detector datasheet and assembly drawing to discuss:
Mounting thread or flange, back focal distance and assembly tolerances.
Maximum lens diameter, length, weight and installation clearances.
FOV switching commands, focus control and required response time.
Coating options and environmental test requirements.
Prototype quantities, acceptance criteria and the production forecast.
Validate samples in the intended camera housing and with the selected detector. Before placing a repeat order, agree the configuration, inspection requirements and documentation needed for incoming acceptance.
Source 40/150mm LWIR Lenses for Volume Production
Beijing IRLENS Optoelectronic Co., Ltd. has developed more than 1,400 infrared lens designs. Our manufacturing capacity is 50,000 lenses annually across the infrared product portfolio.
Optical design, component processing, coating, precision assembly and inspection support OEM development and production. For this dual-FOV model, discuss the imaging, focus and alignment checks required at both optical positions.
Share your first production order and annual forecast so our team can review model-specific capacity, pricing and delivery arrangements. Include any requirements for inspection records, packaging or scheduled releases in the quotation request.
Frequently Asked Questions
Which detector is this 40/150mm lens specified for?
The reference configuration uses a 1024 × 768 uncooled detector with 12 μm pixels. Compatibility with a particular camera core also depends on the detector package, focal plane position and mechanical interface.
Can it be used with a 640 × 512 detector?
A different sensor format changes scene coverage and requires a compatibility review. Provide its model, pixel pitch and package drawing so the optical coverage, image quality and mounting arrangement can be evaluated.
Is the 3.75:1 ratio continuous optical zoom?
It is the ratio between the 150mm and 40mm focal lengths. This product provides two specified optical positions. Continuous zoom requires a lens designed to maintain usable imaging through intermediate focal lengths.
Does the lens provide temperature measurement?
The lens forms the infrared image on the detector. Temperature measurement requires a compatible radiometric camera and calibration that accounts for the optical configuration. Evaluate calibration requirements for both FOV positions if temperature measurement is part of your system.
How do we arrange samples and bulk purchases?
Provide your evaluation quantity, initial production requirement and estimated annual demand. IRLENS can review the configuration and confirm sample availability, minimum order quantity, volume pricing and production lead time in the quotation.
Request a 40/150mm Dual FOV Lens Quotation
Send the specifications for your uncooled thermal camera and the quantities you plan to purchase:
Company name, application and project stage.
Detector model, resolution, pixel pitch and package drawing.
Required scene coverage and observation distance.
Mechanical interface, installation limits and control requirements.
Sample quantity, first production order and annual demand.
Target delivery dates and destination.
Our team can assess the 40/150mm uncooled LWIR dual FOV lens for your platform and discuss the technical and commercial requirements for production supply.
