https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
Boowon BWM2810DN-1000 Varifocal Lens

Boowon BWM2810DN-1000 Varifocal Lens

Boowon Optical
Region: Korea, Republic of
Update: 03/24/2011
Key Specifications
Features:
- 1/3” 1.3-megapixel CMOS 
- Focal length: 2.8 to 10 mm
- F-number: 1.2
- Better for MTF, ghosting and flare than a 2.8 to 10 mm VGA lens by using aspherical glass 
- Back focal length: 5.57 to 12.38
https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions