https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
TP0309VMIR Lens

TP0309VMIR Lens

Fuzhou Topvison Opto-Electronics LTD.
Region: China
Update: 09/18/2007
Key Specifications
Focal Length (mm)  3.5-8 

Aperture (F) 1.4 

Mount CS 

Format (inch)  1/3 ;

Horizontal Field of view  83-32

Dimension (mm)  W30⊙H32⊙L41

Weight (g) 75 

M.O.D (m)  0.1 

Comment  aspheric surface

https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions