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4k Telephoto: SL1250

  • Ultra high resolution, telephoto lens
  • 12-50 mm focal range
  • True 4K, 12 megapixel resolution
  • IR corrected for Day/Night
  • For 1/1.7" sensor sizes or smaller
  • Compact design to fit into domes as small as 4” mini-dome size

CAD Configurator Instructional Video



SL1250M SL1250P
Iris type DC autoiris Manual Iris P-iris
IR cut filter No No No
Motorized focus/zoom No No No
Focus/zoom limit indicator No No No
Focal length 12mm - 50mm 12mm - 50mm 12mm - 50mm
F/# F/1.8 to closed F/1.8 to closed F/1.8 to closed
Resolution True 4K resolution, 12 megapixels True 4K resolution, 12 megapixels True 4K resolution, 12 megapixels
Mount type CS-mount or D25 board mount CS-mount or D25 board mount CS-mount or D25 board mount

Theia's SL1250 lens is designed to be very compact and better image performance compared to competitive products.  Despite the long focal telephoto focal length, this lens is designed for small 4" dome cameras and bullet cameras.  

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 resolution, HD, and multi megapixel cameras.  The lens can be used on cameras up to 12 megapixel resolution giving a crisp image from edge to edge.  

The motorized version of the lens is the TL1250.  

CAD Data




Filter Mount Accessory

This filter mount can be added to the 410 series lenses to allow an external filter (such as band-pass or polarizing filter) to be added to the system. The filter mount works with lenses with 35mm front barrel diameter and is held in place with 3 sharp point set screws. It will accept filters with M55x0.75 threads. Filters are not provided by Theia Technologies.

Part FMT-3555: High performance aluminum filter mount for use with lenses:



Part KIT-9050 Thumbscrew replacement kit for:

The kit includes 2x M2x5 set screws, 2x M2x7 set screws, 2x M2x5 button head screw and Allen keys.



Selected: SL1250A

12-50mm, 4k 12mpx, Day/Night, DC auto iris, 1/1.7" format CS mount telephoto lens


12-50mm, 4k 12mpx, Day/Night, Manual iris, 1/1.7" format CS mount telephoto lens


12-50mm, 4k 12mpx, Day/Night, P-iris, 1/1.7" format, CS mount telephoto lens