1. Product Overview
Product Name: Tokina TC0412DC Lens
Model Number: TC0412DC
Series: Tokina Fixed Focal Length CCTV Lens Series
Article Number: TC0412DC
Manufacturer: Tokina Co., Ltd. (Japan)
Country of Origin: Japan

The Tokina TC0412DC is a high-performance 4 mm fixed focal length lens designed for professional imaging and surveillance applications. It features a fast aperture range of F 1.2 to F 64 and incorporates a DC-controlled auto iris mechanism for precise exposure control under varying lighting conditions. Manufactured in Japan, the TC0412DC reflects Tokina’s long-standing expertise in optical engineering, offering superior image clarity, low distortion, and reliable mechanical construction suitable for continuous operation in industrial and security environments.

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2. Key Features
- Fixed Focal Length: 4 mm focal length optimized for wide-angle coverage, ideal for close-range monitoring and compact imaging systems.
- Fast Aperture: Bright maximum aperture of F 1.2 enables excellent low-light performance, while the adjustable range up to F 64 allows for precise depth-of-field and exposure control.
- Auto Iris (DC Type): Equipped with a DC-driven auto iris mechanism that automatically adjusts the aperture in response to changing light levels, ensuring consistent image brightness and preventing overexposure.
- High Optical Quality: Multi-element optical design with precision-ground glass elements minimizes aberrations and distortion, delivering sharp, high-contrast images across the frame.
- Compact and Durable Construction: Engineered with robust metal housing suitable for continuous operation in demanding environments such as surveillance, machine vision, and industrial inspection.
- CCTV and Machine Vision Compatibility: Designed for use with standard CCTV cameras and compatible with a wide range of image sensors, including 1/3" and 1/2" formats.
- Made in Japan: Manufactured under Tokina’s strict quality control standards, ensuring optical precision, mechanical reliability, and long service life.

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3. Technical Specifications
- Focal Length: 4 mm
- Aperture Range: F 1.2 – F 64 (auto iris control)
- Iris Type: DC Auto Iris (electronic control via camera signal)
- Focus Type: Manual focus adjustment
- Mount Type: Typically CS-mount (standard for CCTV and industrial cameras)
- Image Format Compatibility: 1/3" and 1/2" image sensors
- Field of View (approximate):
- Horizontal: ~62° (1/3" sensor)
- Horizontal: ~80° (1/2" sensor)
- Minimum Object Distance: Approximately 0.3 m (varies by camera configuration)
- Optical Construction: Multi-element, multi-group design with anti-reflective coatings
- Dimensions: Approx. Ø 30 mm × 40 mm length (typical for 4 mm lenses; actual may vary slightly)
- Weight: Approx. 60 – 80 g (depending on mount configuration)
- Material: Precision-machined aluminum alloy housing with glass optical elements
- Finish: Black anodized surface for durability and reduced reflections
- Operating Temperature Range: –10 °C to +50 °C (typical for CCTV lenses)

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4. Functionality
The Tokina TC0412DC operates as a fixed focal length imaging lens with an electronically controlled auto iris. The DC auto iris mechanism receives a control signal from the connected camera, automatically adjusting the aperture blades to maintain optimal exposure as ambient light levels change. This ensures consistent image brightness in both indoor and outdoor environments without manual intervention.

The 4 mm focal length provides a wide-angle field of view, making it suitable for applications requiring broad scene coverage, such as entrance monitoring, parking areas, production lines, and general surveillance. The fast F 1.2 aperture allows for high sensitivity in low-light conditions, reducing the need for additional illumination. The lens can be manually focused to achieve sharp images at the desired distance, and once set, it maintains focus stability even under vibration or temperature fluctuations.

Typical Applications:
- CCTV and IP surveillance cameras
- Industrial inspection systems
- Machine vision and robotics
- Traffic monitoring and security systems
- Automated production line imaging
- Research and laboratory imaging setups

Compatibility:
The TC0412DC is compatible with standard CS-mount cameras and can be adapted for C-mount systems using a 5 mm adapter ring if required. It supports both analog and digital camera systems that provide DC auto iris control signals.

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5. Components & Accessories
Included Items:
- Tokina TC0412DC lens unit
- Rear lens cap (protective)
- Front lens cap (protective)
- Integrated DC auto iris cable (terminated for camera connection)
- User documentation or specification sheet (depending on distributor)

Optional Accessories:
- C-to-CS mount adapter ring (for cameras with C-mount threads)
- Lens hood or shade (to minimize flare in high-glare environments)
- Protective filter (UV or clear glass filter for lens protection)
- Extension rings (for close-focus applications)
- Mounting brackets or lens holders for fixed installations

Connectors:
- DC auto iris connector (typically 4-pin or 3-pin plug compatible with camera’s iris control output)

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6. Installation & Setup
Requirements:
- Compatible camera with DC auto iris control output
- CS-mount interface (or C-mount with adapter)
- Stable mechanical support or camera housing

Mounting Options:
1. Direct Mounting: Screw the lens onto the camera’s CS-mount thread until secure.
2. Adapter Mounting: If using a C-mount camera, install a 5 mm adapter ring before attaching the lens.
3. Securing: Use the lens lock screw (if provided on the camera) to prevent rotation after focusing.

Configuration Steps:
1. Connect the DC auto iris cable to the camera’s iris control socket.
2. Power on the camera and verify iris operation by observing aperture movement under varying light.
3. Adjust focus manually by rotating the focus ring until the image is sharp at the desired distance.
4. Fine-tune aperture response if the camera allows iris level adjustment.
5. Once configured, secure all mechanical adjustments to maintain stability.

Environmental Considerations:
- Avoid direct exposure to moisture or dust; use protective housings for outdoor installations.
- Ensure adequate ventilation to prevent overheating in enclosed systems.
- Clean optical surfaces only with approved lens cleaning materials.

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7. Performance & Capabilities
Optical Performance:
The TC0412DC delivers high-resolution imaging with minimal geometric distortion, optimized for modern CCD and CMOS sensors. The wide aperture ensures excellent light transmission, maintaining image brightness and contrast even in dim environments. The lens’s optical coatings reduce flare and ghosting, improving color fidelity and image sharpness.

Speed and Responsiveness:
The DC auto iris mechanism responds rapidly to changes in illumination, maintaining consistent exposure without visible lag. This makes the lens suitable for dynamic lighting conditions such as entrances, outdoor scenes, or environments with fluctuating artificial light.

Capacity and Coverage:
With its 4 mm focal length, the lens provides a wide field of view, enabling coverage of large areas with a single camera. This reduces the number of cameras required for full scene monitoring, improving system efficiency.

Efficiency and Reliability:
The mechanical design ensures smooth focus and iris operation over extended use. The lens maintains optical alignment and focus accuracy even under continuous operation, vibration, or temperature variation.

Limitations:
- Fixed focal length (no zoom capability).
- Depth of field and perspective are determined by the 4 mm focal length; not adjustable beyond aperture control.
- Requires a camera with DC auto iris support for full functionality.

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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) directives for environmental safety.
- Meets CE marking requirements for electromagnetic compatibility when integrated with compliant camera systems.
- Designed to conform to industry-standard CS-mount and DC auto iris electrical specifications.

Industry Standards:
- CS-mount thread: 1"-32 UN 2A (standard CCTV lens mount)
- DC auto iris control: conforms to EIAJ and CCTV industry electrical interface standards
- Optical performance aligned with IEC and JIS optical testing methodologies

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9. Additional Information
Warranty:
Typically covered by Tokina’s standard manufacturer warranty (1 year limited warranty, depending on region and distributor). The warranty covers defects in materials and workmanship under normal use conditions.

Support:
Technical support and product documentation are available through Tokina’s authorized distributors and service centers. Installation guides, wiring diagrams for DC iris connections, and optical performance charts may be provided upon request.

Maintenance:
- Periodically inspect the lens for dust or smudges on optical surfaces.
- Clean using a soft, lint-free cloth and approved lens cleaning solution.
- Avoid disassembling the lens; internal alignment is factory-calibrated.
- Store in a dry, dust-free environment when not in use.

Updates and Compatibility:
The TC0412DC is part of Tokina’s ongoing line of professional CCTV and industrial lenses. It remains compatible with a wide range of current and legacy camera systems supporting DC auto iris control. Future firmware or hardware updates on camera systems typically do not affect lens compatibility, as the lens operates through standard analog control signals.

Summary:
The Tokina TC0412DC is a precision-engineered 4 mm fixed focal length lens with a fast F 1.2 aperture and DC auto iris control, designed for professional imaging, surveillance, and industrial applications. Its combination of optical quality, mechanical durability, and automatic exposure control makes it a reliable choice for environments requiring consistent image performance under variable lighting. Manufactured in Japan, it embodies Tokina’s reputation for optical excellence and mechanical precision, offering long-term reliability and high-quality imaging for a wide range of professional uses.