https://www.asmag.com/showpost/35280.aspx
Product Info
Dong Ya Conversion Lens

Dong Ya Conversion Lens

Jilin Dongya Optical Group
Region: China
Update: 05/21/2010
Key Specifications
Features:
* Changes the camera’s range of view
* Wide angle lens
* Telephoto lens
https://www.asmag.com/project/assa_abloy_digital_access_control/index.aspx