Basler C11-3520-12M-P 12 MP C-Mount Lens

Technical Overview

Premium C-mount lens with 35mm focal length, F2.0-F16 aperture, 12 MP resolution, and 1.1" image circle.

Key Features

Fits all Basler cameras with a sensor size of up to 1.1"
Robust metal housing
C-mount compatibility
Locking screws for iris and focus
Aperture indicators on iris ring and lens barrel
High contrast imaging
Designed for 140 LP/mm resolution
Low optical distortion, typically -0.10%
Suitable for visible wavelength range (400–700 nm)
Operating temperature range: -20 to 60 °C

Technical Specification Matrix

Parameter	Value
Order Number	2200000578
Focal Length	35 mm ± 5 %
Aperture Range	F2.0–F16
Aperture with Highest Resolution	F2.5
Image Circle	17.6 mm (1.1" format)
Focus Range	0.15 m to infinity
Optimum Working Distance	0.5 m
Relative Illumination at Full Aperture	73 %
Resolution	12 MP / 140 LP/mm
Optical Distortion	Typical -0.10 %
Angle of View (1.1" Format)	Horizontal: 23.0°, Vertical: 16.9°
Wavelength Range	Visible (400–700 nm)
Back Focal Length	12.00 mm
Flange Back	17.526 mm
Mount	C-mount
Focus/Iris Operation	Manual
Operating Temperature	-20 to 60 °C (-4 to 140 °F)
Pixel Pitch	3.57 µm (Design)
Physical Weight (kg)	0.24
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Precision Quality Control in Electronics Manufacturing

This lens is ideal for Automated Optical Inspection (AOI) systems on production lines for circuit boards or microelectronics. Its 12 MP resolution and 140 LP/mm capability, combined with low optical distortion (-0.10%), enable the detection of minute defects such as solder joint imperfections, component misalignments, or trace anomalies. The 0.15m minimum working distance is suitable for close-up inspections.

Problem Solved

Ensures the quality and reliability of electronic components by precisely identifying manufacturing defects that are invisible to the human eye, preventing costly failures and improving product yield.

Automated Optical Inspection (AOI)Microelectronics InspectionSolder Joint InspectionDefect DetectionHigh Resolution ImagingLow Distortion

2. Pharmaceutical Packaging Inspection

The Basler C11-3520-12M-P lens is suitable for inspecting pharmaceutical packaging for label integrity, correct dosage information, batch codes, and tamper-evident seals. The 1.1" image circle and 12 MP resolution provide the necessary detail to read small text and verify print quality, while the robust metal housing ensures durability in industrial environments with an operating temperature range of -20 to 60 °C.

Problem Solved

Guarantees product safety and regulatory compliance by accurately verifying critical information on pharmaceutical packaging, thereby reducing recalls, ensuring traceability, and protecting consumer health.

Packaging InspectionLabel VerificationBatch Code ReadingTamper-Evident SealsMachine VisionQuality Assurance

3. Industrial Metrology and Dimensional Measurement

For applications requiring precise dimensional measurements of small parts, such as gears, connectors, or machined components. The fixed 35mm focal length and high resolution (12 MP, 140 LP/mm) minimize distortion and provide sharp images for accurate measurement algorithms. The C-mount ensures compatibility with a wide range of industrial cameras, facilitating integration into existing measurement systems.

Problem Solved

Enables automated, non-contact measurement of critical dimensions on manufactured parts, improving production consistency, reducing manual inspection errors, and supporting tight tolerance requirements in high-volume manufacturing.

MetrologyDimensional MeasurementQuality ControlNon-Contact InspectionPrecision ManufacturingOptical Measurement