Theia ML183A varifocal lens
Theia ML183A lens drawing

Theia ML183A 1.8-3mm C-mount 1/2.5" F1.8-C 5MP DC-iris rectilinear varifocal lens

Regular price £515.00 £495.00 Sale

The Theia Technologies ML183A 5 Megapixel 1.8-3mm DC-auto iris C-mount lens achieves a 105-90° horizontal angle of view on a 1/3” sensor using patented Linear Optical Technology®.  It achieves an ultra-wide field of view with ULTRA LOW DISTORTION (<1% barrel).  It is suitable for camera sensors up to 1/2.5" and has an iris range from F1.8 -Closed.

The superior quality of this lens combines stunning performance with the highest build quality and will support sensor technology up to 5 megapixels resolution. It is ideal for a wide range of security, broadcast and industrial vision applications. This lens is also available as Manual iris ML183M and CS-mount SL183M and SL183A



  • 1.28 mm lens
  • FULL HD 5MP Resolution
  • Ultra Low Distortion
  • Integrates with 1/3” 1-CCD / CMOS HD cameras
  • Robust, precise mechanics
  • Weight 70 grammes
  • Uses Linear Optical Technology®
    N.B. The lens image will be inverted so the camera should be mounted upside down or the image inverted electronically
Focal Length 1.8-3mm
Image Format 1/3" up to 1/2.5" 
Adjustment Zoom, focus and iris adjustable with locking screws
Aperture Range F1.8 - Closed
Angle of View (H x V) 105-90 degrees x 77-62 degrees (H x V) (1/3" sensor)
Image Circle 6.0mm diameter
Pan Focus Distance 2m - infinity
Modular Transfer Function 140 lp/mm @>20% edge
Minimum Object Distance 0.5m 
Resolution Up to 5MP
Distortion <1% barrel at image edge (for 1/3" sensor)
Back Focus None
Flange Focal Length 12.5mm (in air)
Mount C-mount (metal)
Weight (g) 70 grammes
Dimensions 50mm (diameter) x 45mm (length)
Operating Temperature -20 to +50 degrees C


PRODUCT DATASHEET:                                     

Theia ML183A Lens Data Sheet (PDF)