![]() We are talking about the dispersion of light, which Newton discovered back in 1672. This is why this type of optical interference can be red, magenta, yellow, and any other hue. Halos are simply parasitic glare from a bright source in the frame. Sometimes people confuse purple and red halos in a photo with CA. Monoculars suffer greatly from spherical aberration. For example, above, the model's white shirt flows smoothly into the dark background, erasing the border. Transitions in the area in front of the sharpness area are colored purple, and out of the sharpness area, they are colored dark green.Ī spherical aberration example is the blurring of boundaries between contrasting elements in the sharpness area of a photo. Popular aberrations, usually in the fuzzy area, are called 'fringing around'. How to define chromatic aberration? Very often CA is pronounced in the in-front or behind-the-focus point. But as the saying goes: optimists invent the airplane, pessimists - a parachute, so you have to fight CA to get a good picture. Of course, there are several lenses (and it is lenses that give CA), which still strongly suffer from this malaise. Often CA adds different color spots and stripes, it is especially pronounced in the transition of contrasting objects, often cited as an example with trees. Just remember a physics lesson about the refraction of rays in a prism, and a lens is two prisms connected by bases. The main point of chromatic aberration definition comes from dispersion, simply put, when a white beam splits into its spectrum - this is due to the fact that rays with various wavelengths of light (different colors) are refracted at various angles as they pass through the lens. There are axial, spherical, oblique, and other kinds, but they all boil down to the distortion of a picture. Nowadays high-quality optics is very good at fighting with CA, so it is really hard to see them. Nowadays the struggle over CA is in full swing. If you are an amateur, and you heard somewhere that some lens gives strong CA (color aberration, which is how they are most often called for short), and then you looked at the photo for a long time and did not see anything - do not get upset. ![]()
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