Table 1. Table of DOF blur calculations. The first column is the distance from the observer to the flankers. The second column shows the diameter of the blur circle for this distance, assuming the optics of the eye (given a human 4.5-mm pupil), when the observer is focussed on the fixation point. (Optics are strictly geometrical and do not take account of aberrations.) The fixation point is at 53-cm distance from the observer. The third column lists the aperture sizes (f-stops) that were used to make the differing levels of DOF blur. The level of blur in the resulting photograph from this aperture and distance combination is given in the fourth column. The corresponding distances that the flankers would have in order to result in this level of blur with human optics is in the final column.

Flanker distance (cm)	Eye (theoretical) blur circle (arcmin)	F-stop	Camera (actual) blur circle (arcmin)	Corresponding flanker distance (cm)
		4	9.5	78.25
60	3.4	11	3.4	60.02
		22	1.7	56.30
		4	19.7	163.0
70	7.1	11	7.2	69.90
		22	3.9	60.04
		4	27.4	800 (8 m)
80	9.9	11	10.0	80.40
		22	5.0	60.39