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



SL1250A Selected:
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 CS-mount CS-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





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

Selected: SL1250M

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