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Theia Technologies SY125A CS-Mount 1.3mm f/1.8 Ultra-Wide Auto-Iris Lens, 135°, 5 Megapixel, 2yr warranty


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Theia Technologies SY125A CS-Mount 1.3mm f/1.8 Ultra-Wide Auto-Iris Lens, 135°, 5 Megapixel, 2yr warranty SKU: SY125A

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Theia's 125 series lenses provide the widest field of view without distortion available in the market. 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 in security systems. The rectilinear design also eliminates the dewarping software requirement for many machine vision applications, improving MV system performance.

Similar to Theia's other lenses, the 125 series 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.

Although the 125 series of lenses is not IR corrected, it can be used on Day/Night cameras in some circumstances. If the camera is forced to Day-only mode or if there is no artificial IR illumination, the 125 series of lenses will work well.




Lens model SY125A SY125M
Iris type DC autoiris Manual iris
Focal Length
(field of view)
using Linear Optical Technology®
IR correction Not IR corrected
Mount type CS-mount
F/# F/1.8 to closed
Resolution Up to 5 megapixels
Distortion <3% barrel at image edges (for 1/3" sensor)
Minimum focus 0.5m
Pan focus distance 2.0m to ∞
Lens size Ø36mm x 59mm
Lens weight 100g (approx)
Technical specifications Download pdf
A&E spec Download pdf
Drawing SY125A drawing SY125M drawing
CAD iges file iges (2.6MB) iges (2.8MB)
Owner's manual Download pdf

Only if your camera has a receptical that looks like this can you use an autoiris lens

Autoiris connector

Lens Field of view

Sensor Size 1/4" 1/3" 1/2.5"
Sensor Diagonal Ø4.5mm Ø6.0mm Ø7.2mm
Sensor Format 4x3 4x3 4x3
Field of view (H) 109 ° 125 ° 135 °
Field of view (V) 93 ° 109 ° 119 °
Field of view (D) 122 ° 137 ° 141 °
Additional Information

Additional Information

Model SY125A
Resolution Capability Megapixel, HD
Focal Length No
Iris Auto-Iris
Aperture 1.8
Mount CS Mount
Format Cover No
Brand Theia Technolgoies
Shipment N/A
Manufacturer's Suggested Retail Price No