... optical zoomf=4.7 mm (wide) to 94.0 mm (tele)F1.6 to F3.5Digital zoom12x (240x with optical ... control interfaceVISCA (CMOS 5 V level)Baud rate: 9.6 Kbps, 19.2 Kbps, 38.4 KbpsStop bit: ... timerAdvantage: During the process of acetic acid reaction, it can take the picture automatically, 1 pic/ 2 sec ... the function of zoom in , zoom our, capture the image, ect. There is no need to use foot switch any more. ...