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Diffraction4/18/2023 ![]() The sharpness of the text on the bottle’s label gradually slightly changes. The f-stop where your pictures begin to lose sharpness.Ī diffraction test for the SIGMA 18–35 mm f/1.8 DC HSM Art.The f-stop that gives the sharpest pictures.There are two things about your lens that you’ll learn from this simple test: You’ll see that they’re not all equally sharp. Open these photos in Zoner Photo Studio, zoom in to 1:1 (100%) view, and examine them. For a Sigma ART 18-35/1.8, for example, that will mean pictures in the f/1.8–16 range. Then take a series of pictures with the same focus but different apertures-from the minimum out to a maximum. Fasten the camera to a tripod, set it to aperture priority (the A or Av mode), and focus on an object with fine details-for example the label on a bottle. Take the lens whose diffraction-free range you want to find and mount it on your camera. Luckily, you can find the ideal aperture for your lens via a simple test in which you photograph some object that has fine details. All you need to do is use lower f-stops, for example in the f/4–16 range.īut every lens’ diffraction boundary is different, and it’s good to know where that boundary is. Meanwhile, diffraction is easy to prevent. The light then also falls into what is called the blades’ “geometric shadow” and is diffused when it lands on the camera’s chip. f/16, it is bent more strongly by the aperture blades, causing noticeable diffraction. When light passes through an aperture set to e.g. This picture shows light passing through a closed aperture. Although the picture is sharper overall, its details are softer and lack visibility. The light then bends around their edges and is diffracted beyond them into their geometric shadow. The reason here is that at values this high, the aperture blades are shut too tightly. But that’s a mistake-and that’s because of diffraction. When you’re starting out in photography, it’s easy to think that raising the f-stop all the way up to f/22 will give you maximum sharpness. So it’s good to know what causes diffraction and how to avoid it-and also how to take advantage of it. And that’s something that most photographers want to avoid. Meanwhile, diffraction can make your photos lose sharpness. Diffraction, that is, the bending of light, is a problem that’s encountered by many photographers.
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