Do macro lenses give shallower depth of field than other lenses at the same focal length, aperture, and distance?

Asked 5/12/2018

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If I use a macro lens at normal, non-macro shooting distances, will it produce shallower depth of field than a non-macro prime of the same focal length at the same aperture and subject distance? If not, why do macro shots sometimes appear to have a different focus look? I'm specifically asking about real-world distances, not close-up macro distances.

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

8y ago

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The term 'Macro' means that the lens allows to focus on short distances. This is accomplished by allowing the internal elements to move farther or differently, or sometimes by a switch that moves an additional element that is normally not movable.

Therefore, the macro capability has no effect on DOF.

Of course, as the positioning and count of elements is different, there might be a difference from another lens, but it is very small, and can go either way (more or less DOF).
DOF is mostly defined by the distance to the object, the size of the sensor, and by what is still qualitatively considered 'in focus'. Technically, the DOF is always 0; even a micron off the focus plane the picture is 'out of focus'. But if the fuzzyness is less than a pixel wide, or its amplitude is small enough, so you can't see it, we consider it still 'in focus'.

Originally by user46784. Source · Licensed CC BY-SA 4.0

user46784

8y ago

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Generally, no. At normal shooting distances, a macro lens does not inherently give shallower depth of field than another lens of the same focal length and aperture focused at the same distance. Depth of field is driven mainly by aperture, magnification, subject distance, sensor size, and the acceptable circle of confusion—not by the lens being labeled “macro.”

What makes a macro lens “macro” is its ability to focus much closer, usually by allowing different or greater internal element movement. That closer focusing increases magnification, and higher magnification reduces depth of field. But at the same distance and settings, DOF should be essentially similar to other lenses.

Why might it look different? Lens design can change the rendering of focus. Many macro lenses are designed with a very flat field of focus, while some other lenses have more field curvature. A flatter focus plane can make the in-focus region look more like a thin “slice,” especially across the frame, which may be perceived as different DOF even when the actual DOF is not meaningfully different.

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8y ago

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