an optical device for focussing a camera or other instrument automatically

an optical device for focussing a camera or other instrument automatically

an optical device for focussing a camera or other instrument automatically

an optical device for focussing a camera or other instrument automatically

the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices

of or relating to electronics; concerned with or using devices that operate on principles governing the behavior of electrons

of or relating to electronics; concerned with or using devices that operate on principles governing the behavior of electrons

device for converting analogue signals into digital signals

device for converting analogue signals into digital signals

device for converting analogue signals into digital signals