Basler C125-0618-5M Premium C-Mount Lens

Technical Overview

Premium C-mount fixed focal lens with 6mm focal length, F1.8-F22 aperture, and 5 MP resolution, optimized for 1/2.5" sensor formats.

Key Features

Fixed focal length of 6 mm.
C-mount for industrial camera compatibility.
Aperture range from F1.8 to F22.
Designed for 5 MP resolution and 1/2.5" sensor format (7.3 mm image circle).
Offers excellent image quality with low distortion and minimal vignetting.
Features robust metal housing.
Equipped with locking screws for iris and focus rings to maintain settings.
Includes aperture indicators on the iris ring and lens barrel for easy adjustment.
Provides an accurate focusing mechanism.
Optimized for working distances typical of machine vision installations, with an optimum at 0.5m.
Supports a visible wavelength range of 400–700 nm.

Technical Specification Matrix

Parameter	Value
Lens Type	Fixed Focal Lens
Mount	C-Mount
Focal Length	6.05 mm ± 5 %
Aperture Range (Iris)	F1.8 - F22
Resolution	5 MP (Designed for 230 LP/mm at 2.2 µm pixel size)
Sensor Format	1/2.5" (7.3 mm image circle)
Minimum Working Distance	100 mm (0.1 m)
Optimum Working Distance	0.5 m
Optimum Magnification	0.012
Wavelength Range	Visible (400–700 nm)
Optical Distortion	Typical -9.9 % (barrel distortion)
Overall Optical Length	37.42 mm
Lens Diameter	29 mm
Flange Back	17.526 mm +0/-0.2 mm
Physical Weight (kg)	0.055
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Precision Electronics Inspection

This lens is perfectly suited for detecting microscopic defects on printed circuit boards and other electronic assemblies. Its 5 MP resolution and capability to resolve 2.2 µm pixels enable detailed examination of solder joints, component alignment, and traces. The 6mm focal length provides a suitable field of view for typical PCB sizes, and the C-mount ensures compatibility with standard industrial cameras for automated inspection lines.

Problem Solved

Ensures quality control in electronics manufacturing by precisely identifying minute defects that are invisible to the naked eye, preventing functional failures in final products.

Micro-inspectionPCB inspectiondefect detectionquality controlhigh resolutionsmall pixel

2. Automated Pharmaceutical Packaging Verification

The Basler C125-0618-5M lens is ideal for high-speed inspection of pharmaceutical packaging. Its 5 MP resolution and low distortion are critical for accurate reading of small characters (OCR/OCV), barcodes, and verifying the presence and correct placement of caps, labels, and tamper-evident seals on product containers moving on a conveyor. The 0.5m optimum working distance aligns well with typical packaging line setups.

Problem Solved

Automates the verification of packaging integrity and information accuracy, significantly reducing errors, ensuring regulatory compliance, and enhancing consumer safety in pharmaceutical production.

Barcode readinglabel inspectionpackaging verificationquality assuranceoptical character recognition (OCR)production line automation

3. Industrial Part Gaging and Dimensional Measurement

Utilizing the 5 MP resolution and high contrast, this lens facilitates precise dimensional measurement and gaging of small industrial components. The fixed 6mm focal length provides consistent magnification, which is crucial for accurate measurements, while the robust metal housing and locking screws ensure stable performance and consistent focus in demanding factory environments with potential vibrations.

Problem Solved

Enables automated and highly accurate dimensional quality control of manufactured parts, reducing manual inspection time and improving consistency and precision in gaging applications.

Dimensional measurementgagingquality inspectionmetrologyautomationmachine vision