What is the meaning of circle of confusion?
Circle of confusion is difficult to explain in non-technical terms. You shouldn’t worry about it if you’re just beginning to learn about depth of field. The circles of confusion listed on this page are reasonable values that you can use to get reasonable estimates of depth of field. Note that the circle of confusion is subjective. Thus, some people use 0.025 mm as the circle of confusion for 35mm format, while others will use 0.030 mm. There isn’t a “correct” value. The values of circle of confusion on this website are calculated using, approximately, the circle of confusion that Canon uses for calculating the depth of field tables for their lenses (Canon Camera Museum – Len Details). See Anthony Collins’ article “Aperture and Depth of Field – how it works” for a somewhat technical explanation of circle of confusion. • How accurate are depth of field calculations? DOF calculations are remarkably good estimates of the subjective depth of field in photographs. However, you shouldn’t expe
