Theia Technologies ML183M 1/2.3" 1.8-3.0mm F1.8 Manual Iris Vari-Focal C-Mount Lens, 4K Compatible, IR Corrected (Day/Night), <1% Distortion

Typically 2-3 days
Current Stock:

Format: 1/2.3"

Focal Length: 1.8-3.0mm

Aperture: F1.8

Iris Type: Manual Iris

Mount: C-Mount


Additional Information

4K Compatible; IR Corrected (Day/Night); <1% Distortion; M.O.D. 0.5m.

Note: Due to the type of distortion correction technology used for Theia lenses, the initial image output will be inverted.  This is corrected by either doing an image flip through the camera software or by physically inverting the camera.

Theia's ML183 lenses provide ultra wide field of view without distortion. These are varifocal lenses allowing the user to optimize the field of view from wide angle to ultra wide. The lenses incorporate patented Linear Optical Technology® which allows an ultra wide field of view without barrel distortion unlike other wide angle lenses not including Theia's technology. This rectilinear design allows increased resolution at the edges of the image thus increasing the probability of detection.

Similar to Theia's other lenses, the ML183 is a high quality lens designed to allow the installer to take full advantage of the high resolution of HD and multi megapixel cameras. The lens can be used on cameras up to five megapixel resolution giving a crisp image from edge to edge.

In addition, the ML183 series includes EasyZoom™ which allows the installer to focus the lens once and then adjust zoom or magnification to give the optimized field of view. Only minor focus optimization is required after zooming. There is no need for the iterative focus-zoom-focus method of setup required for other varifocal lenses.

The lens is IR corrected for use with true Day/Night cameras. This IR correction focuses IR light from artificial illumination at the same plane as the visible light allowing the image to remain in focus when the Day/Night camera switches to night mode. Unlike lenses without IR correction, the night image will not be out of focus when using IR illumination.


Lens Field of view

Sensor Size
Sensor Diagonal
Sensor Format
HD (16x9)
Field of view (H)
105° - 77°
116° - 89°
115° - 88°
Field of view (V)
90° - 62°
84° - 57°
99° - 71°
Field of view (D)
117° - 90°
123° - 96°
126° - 100°




SL183 Varifocal Lens Specifications(PDF)



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