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VAIR (Vari-Angle IR): Consistently Brighter Night Vision

Automatic IR angle adjustment to the optical zoom provides consistent IR images in all fields of view

What is Vari-Angle Infrared?

Light is a very fundamental aspect when it comes to image quality. Vari-Angle Infrared (VAIR) is a technological feature in image quality and light performance for security applications to provide clear and vibrant video images in poor lighting conditions.

How Does Vari-Angle Infrared work?

When natural or artificial light is not available, IR illuminators are often used to enhance black and white night time images. Conventional IR illumination only covers a fixed general area. However for long range PTZ surveillance, this limits the distance of the camera's capable scope. VIVOTEK's VAIR function supported on VIVOTEK's IR Speed Dome surveillance cameras provides efficient, uniform IR lighting intensity. The products with the VIVOTEK VAIR function feature varifocal IR illumination and allow users to automatically adjust the IR angle to match the camera lens' FOV. In the scene below, the left image has fixed IR illumination and demonstrates the object is blurred and unrecognizable. In contrast, the right image with VIVOTEK VAIR identifies the object in the infrared region as the illumination angles vary to adjust match the lens FOV.


Why Use Vari-Angle Infrared?

VIVOTEK's IR Technology, VAIR, adopts high efficacy LED and secondary optics to enhance image quality and visual brightness. Therefore, these products supported by the VAIR function are capable to verify the focal length based on the lens adjustment in order to match the light detection with the field of view. Network cameras with the VAIR function are an ideal choice for customers needing the ability to clearly capture video images in complete darkness and to see invisible objects in a broad coverage FOV with IR illumination.

Implementation with Optical Zoom

As discussed earlier, IR illumination typically covers a general area. For speed dome cameras with optical zoom, the IR illuminators need to coordinate with the lens' FOV. Using the VAIR function on enabled network cameras will match the IR illumination automatically to the camera's FOV, or zoom length. The following table details the mapping between the optical zoom and the corresponding IR angle.


Zoom IR Angle Zoom IR Angle
1 x 63.7 16x 4.49
2x 34.86 17x 4.23
3x 23.64 18x 4
4x 17.84 19x 3.96
5x 14.32 20x 3.92
6x 11.95 21x 3.88
7x 10.25 22x 3.84
8x 8.98 23x 3.8
9x 7.98 24x 3.76
10x 7.19 25x 3.72
11x 6.53 26x 3.68
12x 5.99 27x 3.64
13x 5.53 28x 3.6
14x 5.14 29x 3.56
15x 4.79 30x 3.52


VIVOTEK Vari-Angle Infrared (VAIR) is an optical enhancement for viewers to view desired objects and capture video images with clear, identifiable detail in total darkness or at night. In low-light environments, it is necessary to utilize the VAIR function to produce usable image quality for the application of camera security systems.