https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
TP0550VD Lens

TP0550VD Lens

Fuzhou Topvison Opto-Electronics LTD.
Region: China
Update: 09/18/2007
Key Specifications
Focal Length (mm)  5-50

Aperture (F)  1.6

Mount  CS

Format (inch)  1/3

Horizontal Field of view  57-6

Dimension (mm)  W36⊙H47⊙L71

Weight (g)  140

M.O.D (m)  0.1

Comment  DC

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