Speco VFMP2.812DC5 2.8-12mm 5MP Varifocal Lens

Speco Technologies VFMP2.812DC5 Varifocal Auto Iris Lens for 5MP Megapixel Cameras

Overview

The Speco Technologies VFMP2.812DC5 is a precision varifocal lens engineered for 5MP megapixel camera systems. This 2.8 to 12mm lens delivers variable magnification and automatic iris control, making it suitable for installations requiring flexible focal length adjustment and exposure compensation across changing lighting conditions. The varifocal design eliminates the need for multiple fixed-focal-length lenses, simplifying inventory management and reducing deployment time for security integrators and installers.

Key Features

• Varifocal Range: 2.8mm to 12mm focal length provides 4.3x optical zoom capability, enabling coverage from wide-angle to telephoto perspectives within a single lens
• 5MP Optimization: Optical design corrected for 5MP megapixel resolution, ensuring sharp focus across the full sensor without compromise at higher resolutions
• Auto Iris Mechanism: DC-driven automatic iris responds to ambient lighting changes, maintaining optimal exposure without relying solely on electronic gain or shutter adjustments
• DC-Controlled Operation: 5V DC power control for iris actuation, compatible with standard camera control interfaces and common surveillance system architectures
• Manual Focus and Zoom: Precision mechanical adjustment for both focus and zoom rings, allowing technicians to dial in exact field-of-view during installation and maintenance
• Compact Form Factor: Designed for standard C-mount camera bodies, fitting within typical outdoor and indoor dome, bullet, or turret enclosures

Integration and Deployment

The VFMP2.812DC5 integrates with any C-mount 5MP camera supporting DC iris control. This lens is commonly paired with compact megapixel camera bodies deployed in fixed-position surveillance applications—perimeter monitoring, parking structures, traffic intersections, and facility access points. The varifocal design reduces the need to stock multiple fixed lenses, lowering total cost of ownership for integrators managing large-scale installations. Auto iris functionality is particularly valuable in mixed-lighting environments where manual iris lenses would require frequent re-adjustment or result in overexposed or underexposed video.

Installation involves standard C-mount attachment, mechanical focus and zoom calibration, and connection of the DC iris control wire to the camera's iris control output. The lens performs across standard operating temperature ranges typical of outdoor security equipment.

Package Contents

The VFMP2.812DC5 lens ships as a standalone optical module. End-users should verify compatibility with their specific 5MP camera model and confirm DC iris control support before ordering.

Karl Wilson

I've evaluated the Speco VFMP2.812DC5 during several larger facility deployments, and the varifocal design delivers real practical value. Unlike fixed 4mm or 6mm lenses, this lens lets you adjust field-of-view after installation without lens swap-outs—critical when site conditions change or when you need to tighten focus on a specific area of interest. The auto iris saves significant post-processing headache in facilities with skylights or mixed indoor/outdoor zones.

Technical Highlights:

• Focal Flexibility: 2.8–12mm range covers wide to medium telephoto, eliminating inventory bloat for multi-camera jobs
• 5MP Native Design: Optics tuned for 5MP sensors ensure diffraction-limited performance; using this lens on older 1MP or 2MP cameras wastes optical quality
• DC Iris Control: Auto iris tracks light changes without sensor-driven electronic gain, which preserves detail in shadows and prevents blown highlights in backlit scenes

Deployment Considerations:

• Confirm your camera body supports C-mount and has a dedicated DC iris control output pin before purchase
• Plan for mechanical focus verification in the field; varifocal lenses require precise back-focus calibration at your chosen zoom setting
• In very high-vibration environments (HVAC ductwork, industrial machinery), consider mechanical lens locks to prevent zoom creep

For integrators working with compact 5MP fixed-camera systems in multiple-site deployments, the VFMP2.812DC5 is a solid, cost-effective choice that cuts lens changeover time and simplifies the bill-of-materials.