24mm Tapered Cone Lens

Product Brief  

The PL-2445D-M9 is a compact fixed-focal lens engineered by BOSHI Optical Technology for high-resolution industrial imaging. With a 24mm focal length and F/4.5 aperture, this lens delivers exceptional clarity and consistent brightness across a 1/2.5" sensor, covering a maximum image circle of Ø7.4mm. Its all-glass (3-element) construction ensures thermal stability and superior transmission, while the M9 thread mount (P0.35) provides reliable mechanical integration into space‑constrained systems. The lens offers a narrow field of view (16.7° diagonal) ideal for long‑distance inspection, with a TV distortion of merely -0.05% and relative illumination of 97.0% – values that guarantee faithful geometric reproduction and minimal vignetting. The chief ray angle (CRA) stays below 6.6°, ensuring excellent compatibility with modern sensor micro‑lens arrays. Whether deployed in automated optical inspection, precision metrology, or surveillance, this 24mm focal length lens from BOSHI Optical Technology maintains sharpness from center to edge. Its robust optical design supports consistent performance under varying temperatures, making it a dependable choice for OEM integrators who demand repeatable imaging quality without compromising on size or cost.

Detailed Product Description

BOSHI Optical Technology presents the PL‑2445D‑M9, a precision optical lens tailored for 1/2.5" sensor platforms. Below is a comprehensive breakdown of its specifications, performance advantages, and application scenarios.

1. Key Optical Parameters  

Focal Length: 24mm ±5% – provides a moderate telephoto perspective, enabling magnification of distant subjects while maintaining manageable working distances.  

Aperture (F/NO.): F/4.5 ±5% – balances light throughput with depth of field, suitable for well‑lit factory floors and outdoor environments.  

Total Track Length (TTL): 27.7±0.3mm – ultra‑compact footprint for miniaturized camera modules.  

Back Focal Length (BFL): 17.65mm – offers ample clearance for filter or cover glass installation.  

Maximum Image Circle: Ø7.4mm – fully covers the active area of a 1/2.5" sensor without cropping.  

Field of View: Diagonal 16.7°, Horizontal 13.4°, Vertical 10.7° – narrow‑angle geometry ideal for detailed inspection of small targets at range.  

Mount: M9×P0.35 – a standard thread for miniature lenses, ensuring easy interchangeability with existing M9‑based housings.

2. Performance Advantages  

Exceptionally Low Distortion: TV distortion is specified at -0.05%, nearly eliminating barrel or pincushion effects. This ensures accurate dimensional measurement and straight‑line preservation, critical for metrology and alignment tasks.  

High Relative Illumination: At 97.0%, the lens maintains even brightness across the entire sensor, reducing the need for post‑processing shading correction and improving signal‑to‑noise ratio in the periphery.  

Optimized Chief Ray Angle: The CRA of <6.6° matches the microlens tilt of most 1/2.5" sensors, minimizing color shifts and sensitivity loss at the edges. This compatibility enhances overall system quantum efficiency.  

All‑Glass Design (3 elements): The 3‑element glass construction provides superior thermal stability, scratch resistance, and UV resistance compared to plastic alternatives. It guarantees repeatable focus over a wide temperature range (-20°C to +70°C).  

Precision M9 Thread: The fine‑pitch M9 mount allows accurate focus adjustment and secure locking, preventing accidental de‑centering during vibration or shock.

3. Application Areas  

Machine Vision & Automated Inspection: With its 24mm focal length and low distortion, this lens excels in PCB inspection, surface defect detection, and alignment of miniature components. The narrow field of view pairs well with high‑resolution 1/2.5" sensors to resolve fine details (e.g., 5‑10 µm features).  

Industrial Metrology: The near‑zero distortion and high relative illumination make it ideal for gauge measurement, 3D scanning, and calibration systems where absolute accuracy is paramount.  

Security & Surveillance: For long‑range monitoring in corridors, tunnels, or perimeter fencing, the telephoto characteristic combined with F/4.5 aperture offers sufficient depth of field to keep subjects in focus across a wide distance range.  

Embedded Vision Systems: Compact size (TTL <28mm) and M9 thread allow integration into drones, robotics, and handheld inspection devices where weight and space are critical.  

Scientific and Laboratory Imaging: Its stable optical performance supports microscopy auxiliary imaging, beam profiling, and high‑contrast documentation of flat specimens.  

BOSHI Optical Technology has designed the PL‑2445D‑M9 to meet the rigorous demands of modern industrial optics. Each unit undergoes individual collimation and resolution testing to ensure that the 24mm focal length and F/4.5 aperture deliver consistent quality. The lens’s low CRA and minimal distortion further reduce algorithmic complexity in image processing pipelines, accelerating deployment cycles for system integrators. Whether used in high‑speed production lines or stationary measurement stations, this lens offers a reliable, cost‑effective solution that leverages BOSHI Optical Technology’s decades of manufacturing expertise. For custom mount adaptations or AR‑coating variants, the factory provides flexible OEM support, ensuring the PL‑2445D‑M9 fits seamlessly into your existing optical architecture.