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will increase the depth of field but the plane of critical focus will not change. Depth of field extends away from the plane of critical sharpness.
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The image is only critically in focus within a plane. The formula that describes the relationship between plane of sharpness,
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is the distance from the lens to the plane of critical focus (in the object space), and
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which describes apparent sharpness. Reducing the size of the
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243:is the film to lens distance,
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212:{\displaystyle 1/I+1/O=1/F}
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276:{\displaystyle F}
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107:December 2009
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68: –
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129:In a
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