Lenses with an odd number of aperture blades, however, produce two spikes for each blade (for example, a lens with 7 blades produces a star with 14 spikes). For technical reasons too complicated to go into here, lenses with an even number of blades produce stars with spikes equal to the number of blades (for example, a lens with 8 aperture blades produces a star with 8 spikes). The quality and characteristics of the starburst produced by a lens are a result of the number and shape of aperture blades. Of course, there is a huge subjective component to how one feels about a given lens’ starburst quality, so I suggest looking at sample images when considering a lens purchase. Even among pro lenses, there is considerable variation as to the quality and character of the starburst effect created. Prime lenses typically handle flare better than zooms, although many modern zooms do admirably well.Īlso, generally speaking, higher-quality “pro” lenses will produce more defined and higher-quality starbursts than lower-quality consumer lenses. Typically, more expensive lenses will handle lens flare better than less expensive lenses, and new lenses will be better than older models that lack the benefit of modern lens multi-coating technology. Some lenses handle lens flare better than others. Not all lenses handle shooting into the sun equally Canon 5DIII, Canon 11-24mm f/4 lens, ISO 100, f/16, 1⁄ 250 second, focus stack multiple exposure blend for depth of field. For the image below, I was lucky enough to capture the sun rising and the crescent moon setting an ultra-wide lens allowed me to include both within the image frame, and stopping down to f/11 created a crisp starburst. When working with high-quality lenses, I find that f/11 usually gives me a starburst of adequate quality while at the same time maximizing overall image sharpness, although sometimes I’ll stop down a little bit more to enhance the starburst. So, when choosing your aperture, you are trying to find the right balance between a crisp and bold starburst effect, and minimizing the sharpness-reducing effects of diffraction. Typically, a small aperture such as f/11, f/16, or f/22 is necessary to produce an attractive burst the smaller the aperture the better the effect, although you may want to avoid extreme apertures such as f/16 or f/22 because of diffraction (this same optical effect that produces the starburst effect also reduces overall image sharpness at small apertures). The smaller the aperture you use, the more pronounced the effect. As you stop down your lens and select smaller aperture, the blades of the diaphragm come together to form a polygon shape, which is what creates the star-shaped streaks radiating from the light source. An optical phenomenon called diffraction causes the starburst effect as light passes through a small aperture, it is diffracted (or spread out) across the lens’ aperture blades. You won’t get a starburst effect if your aperture is at its widest setting, because at the widest setting the aperture diaphragm is shaped like a circle. Use a small aperture to create the starburst effect
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