1. Product Overview
Product Name: Tokina Lens 4mm F1.2 C-Mount, Manual Adjustable Iris
Model Number: TC0412
Article Number: TC0412
Series: Tokina C-Mount Fixed Focal Length Lens Series
Manufacturer: Tokina Co., Ltd.
Country of Origin: Japan

The Tokina TC0412 is a high-performance fixed focal length lens designed for professional imaging, industrial vision systems, and precision optical applications. With a 4mm focal length and a bright F1.2 aperture, this lens delivers exceptional light-gathering capability and image clarity, even in low-light environments. The manual adjustable iris allows precise control over exposure and depth of field, making it suitable for a wide range of imaging setups. Built with Tokina’s renowned optical craftsmanship and precision-engineered components, the TC0412 ensures consistent optical performance, durability, and reliability in demanding environments.

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2. Key Features
- Fixed Focal Length: 4mm focal length optimized for wide-angle imaging and short working distances.
- High Aperture Ratio: Fast F1.2 maximum aperture for superior low-light performance and shallow depth of field control.
- Manual Adjustable Iris: Smooth, precise manual iris adjustment for fine-tuning exposure and image brightness.
- C-Mount Interface: Standard C-mount thread for compatibility with a wide range of industrial cameras, machine vision systems, and imaging sensors.
- High Optical Quality: Multi-element glass optics designed to minimize distortion, chromatic aberration, and vignetting.
- Compact and Lightweight Design: Ideal for integration into compact imaging systems and embedded camera modules.
- Durable Construction: All-metal housing ensures mechanical stability and long-term reliability in industrial environments.
- Made in Japan: Manufactured under Tokina’s strict quality control standards for optical precision and mechanical integrity.

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3. Technical Specifications
- Model: TC0412
- Focal Length: 4mm
- Maximum Aperture: F1.2
- Aperture Range: F1.2 – F16 (manual adjustable)
- Mount Type: C-Mount (1"–32UN 2A thread)
- Image Format: 1/2" or compatible sensor formats (supports up to 1/1.8" sensors depending on application)
- Field of View (approx.):
- Horizontal: ~90° (on 1/2" sensor)
- Vertical: ~67° (on 1/2" sensor)
- Minimum Object Distance (MOD): Typically 0.1 m (100 mm)
- Focus Type: Fixed focus (preset or adjustable depending on configuration)
- Iris Control: Manual, continuously adjustable
- Optical Construction: Multi-element, multi-group glass lens system (specific element/group count proprietary to Tokina)
- Filter Thread: M27 x 0.5 (if applicable)
- Dimensions: Approx. Ø29 mm × 35 mm length (typical for C-mount 4mm lenses)
- Weight: Approx. 60–80 g (depending on configuration)
- Material: Precision-machined aluminum alloy housing with anodized finish; optical glass elements with anti-reflective coatings.
- Operating Temperature Range: -10°C to +50°C (typical industrial specification)

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4. Functionality
The Tokina TC0412 lens operates as a fixed focal length optical component designed for use with C-mount cameras. Its 4mm focal length provides a wide-angle field of view, making it suitable for applications requiring broad scene coverage or close-range imaging. The manual adjustable iris enables the user to control the aperture size, thereby adjusting the amount of light entering the lens and influencing both exposure and depth of field.

Use Cases and Applications:
- Machine Vision Systems: Ideal for inspection, measurement, and automation systems requiring high-resolution imaging.
- Surveillance and Security Cameras: Provides wide coverage with excellent low-light sensitivity.
- Robotics and Automation: Suitable for embedded vision modules in autonomous systems.
- Scientific Imaging: Used in laboratory setups for microscopy, optical testing, and imaging experiments.
- Broadcast and Industrial Video: Applicable in compact camera systems for monitoring and documentation.
- OEM Integration: Designed for integration into custom imaging devices and optical assemblies.

Compatibility:
- Compatible with all standard C-mount cameras and imaging sensors.
- Works with monochrome and color sensors up to 1/1.8" format.
- Can be adapted to CS-mount cameras using a 5mm C-to-CS adapter ring.
- Suitable for use with CCD and CMOS sensors.

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5. Components & Accessories
Included Items:
- Tokina TC0412 Lens (4mm F1.2 C-Mount)
- Front and Rear Lens Caps (protective covers)
- User Information Sheet or Specification Label

Optional Accessories:
- C-to-CS Mount Adapter (for CS-mount cameras)
- Extension Rings (for macro or close-focus applications)
- Lens Mount Locking Screws or Retaining Rings (for fixed installations)
- Protective Filters (UV, IR-cut, or clear protective glass)
- Lens Holder or Mounting Bracket (for machine vision setups)

Connectors and Interfaces:
- Standard C-mount threaded interface for mechanical and optical coupling.
- No electrical connectors (manual iris and focus).

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6. Installation & Setup
Requirements:
- Compatible C-mount camera or imaging system.
- Proper mechanical support or lens holder to ensure optical alignment.
- Clean, dust-free environment during installation to prevent contamination of optical surfaces.

Mounting Options:
- Direct screw-in mounting to C-mount camera body.
- Use of adapter rings for CS-mount or custom optical assemblies.
- Integration into machine vision enclosures or robotic housings.

Configuration Steps:
1. Ensure the camera and lens mount threads are clean and free of debris.
2. Screw the lens into the camera’s C-mount interface until snug; do not overtighten.
3. Adjust the iris manually to achieve the desired exposure level.
4. If applicable, adjust focus or working distance to achieve sharp image reproduction.
5. Secure the lens using a locking screw or retaining ring if required for vibration resistance.
6. Perform calibration or alignment as needed within the imaging system.

Maintenance Tips:
- Clean optical surfaces only with lens-safe cleaning materials.
- Avoid exposure to excessive humidity or temperature extremes.
- Periodically inspect mechanical threads and iris movement for smooth operation.

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7. Performance & Capabilities
Optical Performance:
- High transmission efficiency due to multi-layer anti-reflective coatings.
- Minimal geometric distortion for accurate image reproduction.
- Excellent corner-to-corner sharpness across the image field.
- Low chromatic aberration and color fringing.

Speed and Light Sensitivity:
- F1.2 aperture provides outstanding low-light performance, allowing shorter exposure times and reduced sensor gain noise.
- Smooth iris adjustment enables precise control over exposure in varying lighting conditions.

Resolution and Image Quality:
- Designed to support high-resolution sensors (up to 5 megapixels or higher, depending on sensor size).
- Optimized for visible light spectrum; optional IR-corrected versions may be available.

Efficiency and Limitations:
- Best performance achieved when used within specified sensor format (1/2" or smaller).
- Wide-angle design may introduce slight barrel distortion at image edges, typical for short focal length lenses.
- Manual iris requires user adjustment; no electronic control interface.

Environmental Durability:
- Rugged mechanical design suitable for continuous operation in industrial environments.
- Resistant to vibration and mechanical stress when properly mounted.

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8. Standards & Compliance
Certifications and Compliance:
- Manufactured in accordance with Tokina’s ISO 9001 quality management standards.
- Complies with RoHS (Restriction of Hazardous Substances) directive for environmental safety.
- Meets CE marking requirements for optical and electronic equipment integration.
- Designed to conform to standard C-mount mechanical and optical specifications (JIS B 7123).

Industry Standards:
- C-Mount Interface Standard (1"–32UN 2A thread).
- Optical performance aligned with industrial imaging standards for machine vision lenses.
- Compatible with standard camera calibration and alignment procedures used in automated vision systems.

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9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 1 year) covering defects in materials and workmanship under normal use.
- Extended warranty options may be available through authorized distributors.

Support and Service:
- Technical support available through Tokina’s authorized service centers and distributors.
- Product documentation, datasheets, and CAD drawings available upon request.
- Replacement parts and accessories available for long-term maintenance.

Maintenance and Care:
- Store in a dry, dust-free environment when not in use.
- Avoid direct exposure to sunlight or corrosive environments.
- Clean lens surfaces with approved optical cleaning solutions and microfiber cloths.

Product Lifecycle and Updates:
- The TC0412 is part of Tokina’s ongoing line of industrial and machine vision lenses.
- Periodic updates to coatings, mechanical design, or optical performance may be introduced to enhance compatibility with newer imaging sensors.
- Backward compatibility with existing C-mount systems is maintained across product revisions.

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Summary
The Tokina TC0412 (4mm F1.2 C-Mount Manual Iris Lens) is a precision-engineered optical component designed for professional imaging and industrial vision applications. Its combination of a wide 4mm focal length, bright F1.2 aperture, and manual iris control provides exceptional flexibility for low-light imaging, wide-angle coverage, and precise exposure adjustment. Built with Tokina’s high-quality optical glass and durable metal housing, the TC0412 ensures long-term reliability and consistent performance in demanding environments.

With full compliance to C-mount standards, compatibility with a wide range of cameras, and adherence to international quality and environmental regulations, the TC0412 stands as a robust, high-performance solution for machine vision, surveillance, robotics, and scientific imaging systems. Its Japanese manufacturing heritage underscores Tokina’s commitment to optical excellence, precision engineering, and dependable performance across diverse imaging applications.