ST  2812  14  Z          ST  28  12  Z
   A          B        C       D                 A       B       C     D

A —— Brand symbol ：
ST is the short form of “ SOEST”,it is uniform for all Models.

B —— The focal length ：
To varifocal lens:four numbers means focal length is 2.8mm -12mm ;
To monofocal lens:two numbers means focal length is 2.8mm ;

C —— The aperture ：
The last two numbers means lens aperture(F number)

D —— Lens types

Z	-- Auto Iris Direct Driver	V	--Auto Iris Video Driver
S	Manual Iris	F	-- Fixed Iris
H	--Board/Dome Lens(S mount)	A	--Motor Zoom Lens