🔍 Fixed Focal Length Lenses by Yighen

Precision Optics for Consistent Imaging Performance

🎯 What Are Fixed Focal Length Lenses?

Fixed focal length lenses, also known as prime lenses, have a constant focal length and are designed for maximum optical performance at that specific field of view. Unlike zoom lenses, they offer superior resolution, lower distortion, and greater stability—making them ideal for demanding machine vision, medical imaging, automation, and scientific analysis.

At Yighen, we offer a full range of fixed focal length lenses, covering short, medium, and long working distances, visible to infrared bands, and sensor formats from 1/4" to 1.1" and beyond.

🧩 Why Choose Yighen’s Prime Lenses?

• 📸 Superior MTF across the entire image circle

• 📏 Ultra-low distortion <0.2% in most designs

• 🔬 Supports 2MP, 5MP, 8MP, and 12MP+ sensors

• 🧲 Focus & iris locking mechanisms for industrial use

• 🌈 Visible / NIR / SWIR spectral designs

• 🧪 Available in glass, plastic hybrid, and IR materials

• 🛠️ Customized for working distance, field angle, and telecentricity

📊 Typical Specifications (Standard Range)

🔬 Applications of Fixed Focal Length Lenses

🔧 Industrial Inspection

Defect detection, metrology, barcode reading

🧪 Scientific Imaging

Laboratory cameras, fluorescence, microscopy attachments

🧠 AI Vision / Smart Devices

Edge-AI sensors requiring fixed FOV and calibration

📷 High-Speed Imaging

Cameras needing minimal motion blur and zero focus drift

🩺 Medical Imaging

Endoscopes, diagnostic modules, optical probes

🏭 Yighen’s Advantage: From Design to Assembly

Unlike many off-the-shelf lens providers, Yighen integrates:

• 🧠 Custom optical & opto-mechanical design

• 🛠️ Precision freeform/asphere machining for key elements

• 🧼 Cleanroom lens assembly & cementing

• 📈 Full optical metrology reports (MTF, centration, distortion)

• 🔩 Small batch or volume production from our Dongguan facility

Whether you need a ruggedized wide-angle 6 mm lens or a low-distortion telephoto 75 mm design, we’ll help match the optics to your sensor and use-case.

💼 Case Highlight: Fixed Lens for Line-Scan Application

Client: US packaging inspection OEM
Specs: 35 mm, F/2.8, low distortion <0.1%
Sensor: 8k line-scan CCD, 5 µm pixel pitch
Outcome: Delivered <3 µm resolution across full FOV

🎯 Rugged, Reliable, and Ready for Vision Applications

Yighen’s fixed focal length lenses are optimized for performance, stability, and ease of integration. Whether you need wide-angle, standard, or telephoto lenses for industrial vision, embedded systems, or medical imaging—we deliver low-distortion, high-contrast optics, tailored to your sensor and application.

📩 Request a Custom Fixed-Focus Design
Tell us your focal length, sensor format, working distance, and target resolution—we’ll engineer a solution that fits.

📘 Download Technical Specs & Layout Drawings
Find optical specs, mechanical layouts, and system compatibility in our Downloads section.

🏢 Learn About Our Engineering & Production Process
Explore our full workflow from optical design to finished assemblies on the About page.

🔗 Related Content

• 🔍 MegaPixel Lenses
  Support for 5MP–50MP sensors with precision MTF and tight tolerancing.

• 🔬 Telecentric Lenses
  High-accuracy lenses for metrology, pick-and-place, and inspection systems.

• 📦 Optical Assembly & Lens Modules
  Integration-ready modules with mechanical housing, alignment, and testing.

• 🧠 Optical Engineering Services
  Complete support from concept to prototype and simulation.

• 🧪 Optical Metrology & Testing
  Verify focal length, resolution, distortion, and optical performance before shipment.