![]() ![]() If you’re using a macro lens such as the 100mm or 110mm, both popular lenses for still life and food photography, you’ll most benefit from using focus stacking, as macro lenses have a very shallow depth of field. It also reduces the brightness of the image.įocus stacking allows you to increase the depth of field of images taken at the sharpest aperture. If a small object fills the frame, it’s often so close that its entire depth cannot be in focus at once.ĭepth of field is normally increased by stopping down in aperture (using a larger f-stop number), but beyond a certain point, lens diffraction will counteract the benefit of the image being focus. And depth of field is smaller (shallower) for objects closer to the camera. We tend to shoot with the camera relatively close to our subject. Getting sufficient depth of field can be particularly challenging in food and still life photography. Notice also that the background isn’t as blurred out, due to the increase in the depth of field.Īs you can see, stopping down in aperture provided a bit more focus, but it degraded the quality of the image. The image isn’t sharp and it looks a bit grainy. Now compare this image of the same shot at f22. Note that not all the petals are in focus. At f5.6, you can see that the image quality is good and that the image has a smooth and refined look. Here is an image of some pink fabric flowers that I shot with my Canon 100mm macro lens. As you stop down, the fine details in your image will begin to blur out. It doesn’t matter how good your lens is, your images will grow less sharp at apertures over f16 due to a law of physics. This causes the light to hit the subject less precisely and the image will be a bit muddy and less sharp. When you stop down to apertures such as f22, the light hits and bounces off the edge of the aperture blade. When the aperture is wide (lower f-stop number), say anywhere from f1.4 to f8, there is a lot of light hitting the camera sensor directly. ![]() For example when we see light hit water droplets, or a spider web.ĭiffraction also occurs in our lens and on our camera sensor. We see diffraction all the time in our daily life. Basically, diffraction occurs when light interacts with an object. Lens diffraction is a phenomenon of optical physics.
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