DAHUA HAC-B3A21-Z-2712 HDCVI bullet camera with 2.7–12 mm varifocal lens

DAHUA HAC-B3A21-Z-2712 is an HDCVI bullet camera with a 2.7–12 mm varifocal lens designed for fixed video monitoring in indoor and outdoor environments. The camera provides adjustable framing through its motorized or manual zoom range, enabling wider area coverage or closer detail on selected targets. Built to integrate with HDCVI recording systems, it is suitable for perimeter, entrance and site surveillance where clear, configurable field of view is required.

Advantages

This HDCVI bullet camera delivers flexible optical coverage thanks to its 2.7–12 mm varifocal lens, allowing installers to fine-tune the viewing angle on site. The bullet form factor supports easy mounting on walls or ceilings and provides a straightforward solution for fixed surveillance points. Compatibility with HDCVI systems simplifies integration with existing analog-over-coax infrastructures while maintaining high-quality video transmission for monitoring and recording.

Suitable for

• Perimeter and fence-line surveillance
• Building entrances and parking areas
• Retail and small commercial site monitoring
• Indoor corridors and production floor overview

Key specifications

• Camera type: HDCVI bullet camera suitable for fixed mounting
• Lens: Varifocal 2.7–12 mm for adjustable field of view
• Suitable environments: Indoor and outdoor installations
• Mounting options: Wall or ceiling mount compatible bullet housing
• Integration: Works with HDCVI video transmission systems over coax

How to use

Install the camera on a stable surface using appropriate mounting hardware and align the lens to cover the intended area. Adjust the 2.7–12 mm varifocal lens to set the desired field of view and focus for clear image detail. Connect video and power according to HDCVI system requirements and verify signal and framing on the recorder or monitor. Position the camera to avoid direct glare from light sources and ensure weatherproof seals are intact for outdoor installations.

Recommendations

For best results, perform lens adjustment and focus at the installation height and lighting conditions representative of typical operation. Use surge protection and weatherproof cable glands for outdoor runs. Regularly check lens cleanliness and housing seals to maintain image quality and reliability.