The presence of monocular depth sense is identified with a light field imaging system which can project up to 8 different view images simultaneously to a viewer’s each eye. The depth of field of subjects’ eyes increases further as the number of simultaneously projected images to subjects’ each eye increases more, though the increasing rate is somewhat different for different subjects. The diopter values exceed more than those of real object as the number exceeds more than six for the binocular viewing while it is eight for monocular viewing. The increasing rate of the diopter values for the binocular viewing is more than that for monocular viewing. These results assure that a natural viewing condition can be incorporated in light field imaging systems. These results are derived from 7 subjects under age 35, having eye sight greater than 1.0.