Basler C125-1218-5M Fixed Focal Lens

Technical Overview

5 MP C-mount fixed focal lens with 12mm focal length and F1.8-F22 aperture for high-resolution machine vision.

Key Features

C-mount compatibility for various cameras.
Fixed focal length of 12 mm for consistent imaging.
Manual iris with an aperture range from F1.8 to F22.
Supports 5 MP resolution, designed for 230 LP/mm at 2.2 µm pixel size.
Optimized for cameras with a sensor format of up to 1/2.5" (7.3 mm image circle).
Robust metal housing construction.
Exhibits low ghosting and veiling glare for clear images.
High contrast imaging capabilities.
Equipped with locking screws for stable iris and focus settings.
Includes aperture indicators on the iris ring and lens barrel.
Features an accurate focusing mechanism.
Compact design with a 29 mm diameter.
Optimized for a working distance of 0.5 meters.
CE certified, ensuring compliance with European safety standards.

Technical Specification Matrix

Parameter	Value
Type	Lens
Lens Type	Fixed Focal Lens
Focal Length	12.05 mm ± 5 %
Aperture Range	F1.8–F22
Iris Type	Manual
Resolution	5 MP (Designed for 230 LP/mm)
Mount	C-mount
Sensor Format	1/2.5" (7.3 mm image circle)
Min. Working Distance	200 mm (0.2 m)
Wavelength Range	Visible (400–700 nm)
Optical Distortion	Typical -2.2 % (barrel distortion)
Flange Back	17.526 mm +0/-0.2 mm
Overall Optical Length	35.93 mm
Filter Thread	M25.5 x 0.5
Physical Weight (kg)	0.07
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Precision Quality Control in Electronics Manufacturing

Inspection of tiny components, such as solder joints and PCB traces, on circuit boards for defects during the manufacturing process.

Problem Solved

The lens's 5 MP resolution and 230 LP/mm capability allow for clear imaging of very small features (2.2 µm pixel size), enabling accurate detection of minute flaws that would be missed by lower-resolution optics. The 200mm minimum working distance facilitates close inspection without physical interference, crucial for micro-electronics.

Machine VisionPCB InspectionSolder Joint InspectionHigh ResolutionMicro-inspection

2. Automated Medical Device Assembly and Inspection

Automated assembly and inspection of small medical device components, such as catheters or surgical tools, requiring precise alignment and defect detection in controlled environments.

Problem Solved

The lens's high resolution and minimal distortion ensure accurate measurement and inspection of critical dimensions and surface imperfections on small, intricate medical parts. The robust metal housing and locking screws provide essential stability in cleanroom or vibratory manufacturing environments, maintaining image integrity.

Medical Device ManufacturingAutomated InspectionPrecision AssemblyQuality AssuranceSmall Part Inspection

3. Material Surface Analysis and Defect Detection

Detailed examination of material surfaces (e.g., metals, ceramics, textiles) for scratches, cracks, or structural irregularities in industrial quality control and research.

Problem Solved

The lens's ability to render crisp images with high contrast and low distortion is crucial for reliably identifying subtle surface defects or textural variations. Its fixed 12mm focal length provides a consistent field of view for repetitive, standardized inspection tasks across various materials.

Surface InspectionMaterial ScienceDefect DetectionQuality ControlMicro-structure Analysis