Depth of Focus

Depth of focus is the maximum distance by which the film in a camera may buckle (move forward or backward along the axis) without causing the blurring of the image.

Let r be the radius of the exit pupil of the coaxial optical system (camera lens system) and P the point image. When film is moved forward by a distance x₁, the ray passing through the point A on the circumference of the exit pupil E, cuts the plane passing through P₁ and normal to the axis at the point B. When the film is moved backward by a distance x₂, the ray passing through the point A cuts the plane passing through P₂ and normal to the axis at the point C. The location of the point P₂ is such that x₁ = x₂.

∴ P₁B = P₂C = R

Δs PP₁B and POA are similar



But, x₂ = x₁



Determination of the depth of focus in a camera is of the great importance. It helps in estimating the amount by which the film in the camera may buckle without disturbing the image beyond the tolerable limit.

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