Depth of field is the distance between the farthest and nearest object where the image is acceptably sharp; the exact depth varies depending on magnification and f-number (the ratio of the focal length to the aperture’s diameter) used. Reminder, magnification is primarily determined by focal length, subject distance, and circle of confusion (which is the radius at which blur becomes visible). Circle of confusion is related to the concept of “out of focus”. Specifically, an image becomes “out of focus” when the blurred image of the feature becomes larger on the sensor than some circle of confusion.
Depth of field is the distance between the farthest and nearest object where the image is acceptably sharp; the exact depth varies depending on magnification and f-number (the ratio of the focal length to the aperture’s diameter) used. Reminder, magnification is primarily determined by focal length, subject distance, and circle of confusion (which is the radius at which blur becomes visible). Circle of confusion is related to the concept of “out of focus”. Specifically, an image becomes “out of focus” when the blurred image of the feature becomes larger on the sensor than some circle of confusion.