![]() ![]() As light passes by the aperture blades, it’s diffracted. But eventually we run into the fuzzy brick wall of diffraction. Depth of field doubles every two stops we close down the aperture. Of course, we can regain some, or all, of that lost depth of field by closing down the aperture. This is why we have such a hard time getting much in focus as we move in closer to a subject or use longer lenses. Which ƒ-stop Is Best For Creating Stacked Focus Images?ĭepth of field is inversely proportional to the square of the magnification. It’s also useful in landscape photography, however, when we want the depth of field to begin closer than that achieved when the lens is focused at the hyperfocal distance for the smallest usable aperture. This technique is most commonly applied to close-up work. In addition to extending the depth of field, the sharpness is enhanced, because each capture creates another focus plane that is in true focus-not just acceptably small circles of confusion, which appear sharp in small prints, but may look mushy in larger ones. ![]() The stacked focus technique allows us to overcome this limitation by making multiple captures, each at a slightly different focus distance, then use software that selects the sharpest pixels from this stack of captures to extend the depth of field through the entire photograph or a specific range within the photograph. Painters have depicted the world this way for years, but prior to the advent of stacked focus, photographers were limited to what a lens could resolve in a single capture. When we view a composition, our eyes scan the scene, refocusing on every detail, then our brain composites everything we’ve seen into a visual memory with the entire scene sharp. Using the stacked focus technique, we can extend depth of field, as well. For years, we’ve been using high dynamic range (HDR) techniques, combining bracketed captures to extend the range of exposure. ![]() He created the series of exposures shown here and on the next page, shooting each one for maximum sharpness in a limited area and then composited the final image together.įor the first time since the invention of the medium, photographers are now able to create images that rival our visual memory. Craig Blacklock defied the limits of depth of field and diffraction to create this image. ![]()
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