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Computar Ganz varifocal CCTV lens 4.5-12.5mm CS-mount metal barrel

Computar Ganz

Computar Ganz HG3Z4512FCS-IR 4.5-12.5mm CCTV Camera Lens

SKU CH-2Y05-KT55E

Varifocal IR-corrected lens for CS-mount day/night cameras with 1/2" sensors, 4.5-12.5mm focal range, f/1.2 aperture, DC auto iris, and manual zoom/focus

  • Varifocal 4.5-12.5mm range lets you frame scenes without moving the camera
  • IR-corrected optics eliminate focus shift when the camera switches to night mode
  • Bright f/1.2 aperture captures usable footage in very low light
  • DC auto iris maintains exposure automatically as lighting changes
  • All-glass aspherical elements in a metal barrel reduce distortion and withstand vibration

CS-Mount IR Lens for 1/2" Sensors

The Computar Ganz HG3Z4512FCS-IR is a varifocal CCTV lens built for CS-mount cameras using 1/2" format sensors. It covers a 4.5-12.5mm focal range with 3x optical zoom and a bright f/1.2 maximum aperture. All-glass aspherical optics and IR correction eliminate focus shift when switching between day and night modes. Manual zoom and focus rings include locking set screws for a fixed setup.

Installers Needing Flexible Field of View

This lens suits installers who must adjust the viewing angle after the camera is mounted, avoiding a return trip to reposition the hardware. The DC auto iris automatically controls exposure across changing light conditions. Buyers using cameras with larger sensor formats or non-CS mounts should look elsewhere, as the optical circle and flange distance are matched specifically to 1/2" CS-mount devices.

Locking Screws Secure Critical Adjustments

The bundled locking set screws let technicians lock both zoom and focus positions once the scene is framed, preventing vibration or tampering from shifting the image. A durable metal barrel and mount resist wear during repeated adjustments. IR-corrected glass maintains sharp focus under infrared illumination without the focus drift common on standard lenses.

Highlights

  • Varifocal 4.5-12.5mm range lets you frame scenes without moving the camera
  • IR-corrected optics eliminate focus shift when the camera switches to night mode
  • Bright f/1.2 aperture captures usable footage in very low light
  • DC auto iris maintains exposure automatically as lighting changes
  • All-glass aspherical elements in a metal barrel reduce distortion and withstand vibration

Specifications

BrandComputar Ganz
ModelHG3Z4512FCS-IR

Questions about this item

What camera mount and sensor size does this lens require?

The lens is built for CS-mount cameras that use a 1/2" format sensor.

Will the DC auto iris function with an older analogue camera that only has a video-iris connector?

No — the lens needs a camera that supplies DC auto-iris drive; a video-iris output will not control the aperture.

How can I confirm the IR correction is working once the lens is mounted?

Switch the camera to night mode with IR illumination active; the image should stay sharp without refocusing.

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