Basler C125-0818-5M Premium Fixed Focal Lens

Technical Overview

Fixed 8mm focal length C-mount lens with F1.8-F22 aperture, 5MP resolution, and 2.2 µm pixel support. Features locking screws for industrial machine vision.

Key Features

C-mount compatibility
Fixed focal length of 8 mm (8.11 mm ± 5 %)
Aperture range from F1.8 to F22
5 MP resolution
Supports sensors up to 1/2.5" format (7.3 mm image circle)
Metal housing
Low ghosting and veiling glare
High contrast
Locking screws for iris and focus
Aperture indicators on iris ring and lens barrel
Accurate focusing mechanism
Minimum Object Distance (M.O.D.) of 100 mm (0.1 m)
Designed for 230 LP/mm (2.2 µm pixel size) resolution
Compact design with 29 mm diameter
Visible wavelength range (400–700 nm)

Technical Specification Matrix

Parameter	Value
Focal Length	8.11 mm ± 5 %
Aperture Range	F1.8–F22
Image Circle	7.3 mm (1/2.5" format)
Mount Type	C-Mount
Resolution	5 MP, designed for 230 LP/mm (2.2 µm pixel size)
Minimum Object Distance (M.O.D.)	100 mm
Filter Thread	M35.5 x 0.5
Wavelength Range	Visible (400–700 nm)
Optical Distortion	Typical -5 % (barrel distortion)
Physical Weight (kg)	0.07
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Speed Quality Control of Small Components

This lens can be integrated into automated optical inspection (AOI) systems for electronics manufacturing or precision parts assembly. Its 5 MP resolution and 2.2 µm pixel support allow for the detection of minute defects or misalignments on small components, while the F1.8 aperture supports high-speed image acquisition in varied lighting conditions.

Problem Solved

Ensures stringent quality standards by accurately identifying microscopic flaws on fast-moving production lines, preventing defective products from progressing through the manufacturing process.

Machine VisionAutomated Optical Inspection (AOI)Micro-defect detectionHigh-resolution imagingSmall sensor integrationFast image acquisition

2. Robotic Pick-and-Place Guidance in Compact Spaces

The compact design (29 mm diameter) and 8 mm fixed focal length of this lens make it ideal for robot arm-mounted vision systems, providing a sufficiently wide field of view for navigating and precisely positioning components in confined industrial workspaces. The robust metal housing and locking screws ensure optical stability during robot movement and vibrations.

Problem Solved

Enables precise visual guidance for robots in environments where space is restricted and vibrations are present, improving the accuracy and reliability of automated assembly and material handling tasks.

Robotic VisionPick-and-PlaceCompact designC-MountVibration resistanceWide field of viewAutomated assembly

3. Barcode and 2D Code Reading on Production Lines

With its 5 MP resolution and ability to focus as close as 100 mm, this lens is highly suitable for reading high-density 1D and 2D barcodes or data matrix codes on items on a conveyor belt. The f/1.8 aperture allows for good performance even with less-than-ideal ambient lighting conditions, ensuring readability across different environments.

Problem Solved

Accurately decodes small, intricate, or poorly lit barcodes and 2D codes on products for tracking, sorting, and inventory management, critical for logistics and manufacturing traceability systems.

Barcode reading2D code scanningHigh resolutionClose-up imagingIndustrial traceabilityVariable lightingLogistics automation