Theia Technologies SL1250A 1/1.7" 12-50mm F1.8 DC Auto-Iris Vari-Focal CS-Mount Lens, IR Corrected (Day/Night), 4K Ultra HD, 12 Megapixel Rated

TH SL1250A
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Format: 1/1.7"

Focal Length: 12-50mm

Aperture: F1.8

Iris Type: DC Auto-Iris

Mount: CS-Mount

Theia's true 4K resolution telephoto lens for long distance security surveillance and license plate recognition (LPR) applications.  With varifocal length from 12-50mm and superior imaging performance, the SL1250 is designed for image sensors from 1/2.3" up to 1/1.7".   The lens is designed to be very compact so it can be used in small enclosures such as 4" domes.  

Additional Information

12 Megapixel Rated; IR Corrected (Day/Night); 4K Ultra HD

Theia's SL1250 lens is designed to be very compact to fit into small spaces such as 4" domes.  This lens is designed for use on the new 4K box cameras for security and machine vision applications such as long distance fence line monitoring, license plate recognition (LPR) and other long distance security applications.  

The SL1250 versions are available with motorized or manual iris and CS mount whereas the sister TL1250 versions include motorized zoom and focus, photo interrupter limit switches, and board mount options.  

Similar to Theia's other lenses, the SL1250 series is a high quality lens designed to allow the installer to take full advantage of the high resolution of 4K, HD, and multi megapixel cameras.  The lens can be used on cameras up to 12 megapixel resolution (true 4K) giving a crisp image from edge to edge.



Iris type DC autoiris
Focal length 12mm - 50mm varifocal
F/# F/1.8 to closed
Resolution true 4K resolution, 12 MP
IR correction Yes
Mount type CS-mount
Image sensor size 1/2.3" up to 1/1.7"






pdf-icon.pngSL1250 Lens Family Specifications(PDF)

pdf-icon.pngLens owner's manual (PDF)



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Lens Type:
Vari-Focal / Manual Zoom
Megapixel Rating:
12 MP