a multi - lenses optical device with high resolution is provided for converting an optical image into electronic signals . the multi - lenses optical device includes a focusing unit for focusing a plurality of sections of the optical image to correspondingly generate a plurality of focused image sections with the same ratio and having the same optical path length , a photoelectric conversion unit for converting the plurality of focused image sections into the electronic signals , a switching unit for sequentially having each one of the focused image sections or the optical image sections selected and having the selected image section transmitted to the photoelectric conversion unit , and a light - reflecting unit mounted between the photoelectric conversion unit and the focusing units for transmitting the plurality of image sections .