4.6mm F1.0 640×512 LWIR Thermal Infrared Camera Lens
Overview
The 4.6mm F1.0 LWIR Thermal Infrared Camera Lens is designed for uncooled thermal imaging systems using 640×512 infrared detectors with a 12μm pixel pitch. Its fast F/1.0 aperture and ultra-wide diagonal field of view of at least 100° support efficient infrared energy collection and broad-area thermal monitoring.
Featuring an athermalized optical design, this compact lens maintains focus across changing temperatures without mechanical refocusing. With an operating temperature range of -40°C to +60°C, IP67 protection, and a lightweight construction, it is suitable for integration into outdoor, industrial, security, and mobile thermal imaging equipment.
Key Features
• 4.6mm focal length with a fast F/1.0 aperture
• Designed for 640×512 uncooled infrared detectors with 12μm pixel pitch
• Ultra-wide diagonal field of view of ≥100°
• Optimized for the 8–12μm long-wave infrared (LWIR) band
• Average transmittance of ≥90%
• Relative illumination greater than 80%
• Optical athermalization helps maintain focus as temperatures change
• Continuous focusing range from 0.3m to infinity
• Compact, lightweight design weighing less than 26g
• IP67-rated sealing for demanding outdoor environments
Technical Specifications
Product Type: LWIR Thermal Infrared Camera Lens
Focal Length: 4.6mm
F-Number: F1.0
Compatible Detector: 640×512
Detector Pixel Pitch: 12μm
Diagonal Field of View: ≥100°
Spectral Band: 8–12μm
Average Transmittance: ≥90%
Relative Illumination: >80%
Focus Design: Optical athermalization
Focus Range: 0.3m to infinity
Coating: Anti-reflective (AR) coating on the exposed surface
Back Focal Distance: 4.65mm ±0.2mm
Dimensions: ≤24mm diameter × 26mm length
Weight: <26g
Operating Temperature: -40°C to +60°C
Storage Temperature: -45°C to +65°C
Mount Interface: Rear flange mount
Lens Thread: M19 × 0.5–6g
Protection Rating: IP67
Applications
• Security and perimeter surveillance
• Wide-area thermal monitoring
• Industrial equipment inspection
• Electrical panel and facility monitoring
• Fire detection and search-and-rescue equipment
• Automotive thermal imaging and night-vision systems
• UAV and drone thermal imaging payloads
• OEM thermal camera and infrared imaging system integration
FAQ
Q1: Which thermal detector is this lens designed for?
A: It is designed for uncooled 640×512 infrared detectors with a 12μm pixel pitch.
Q2: What infrared wavelength range does it support?
A: The lens is optimized for the 8–12μm long-wave infrared (LWIR) band.
Q3: What is the field of view?
A: The specified diagonal field of view is at least 100°. The actual horizontal and vertical fields of view depend on the detector and optical configuration.
Q4: Does the lens need manual refocusing when the temperature changes?
A: Its optical athermalization design is intended to maintain focus over changing temperatures without mechanical refocusing.
Q5: What is the minimum focusing distance?
A: The specified focus range starts at 0.3m and extends to infinity.
Q6: Is the lens suitable for outdoor use?
A: The lens has an IP67 sealing rating and an operating temperature range of -40°C to +60°C. Confirm the complete camera assembly's environmental rating before outdoor deployment.
Q7: What mounting interface does it use?
A: It uses a rear flange mount with an M19 × 0.5–6g lens thread. Please verify mechanical and optical compatibility with your thermal camera module before ordering.