1/7/2024 0 Comments Bokeh lens flare hdThe coat must be ¼ wavelength in thickness. It is the coat thickness that does the trick. To mitigate reflections, the surfaces of each lens are treated with a see-through mineral coat. It is this reflected light that is the nemesis. Since each surface has a high polish, each will reflect light. The power and the material of construction and the figure (shape) all combine to mitigate aberrations. Some are made from dense glass, other less dense. Most have positive power (convex) and some have negative power (concave). The camera lens utilizes multiple lens elements. All optical systems suffer from lens aberrations that degrade the image. The optician does his/her best to midrate flare. Optical flare results when stray light intermingles with the image forming rays in an optical system. Depending on the layout and orientation of the color pixels in your monitor, you probably won't see the same perfect grid pattern. Some of the rays will constructively interfere, while others will destructively interfere, canceling each other out. You will see an interference pattern caused by multiple near-parallel light rays bouncing off the individual pixel elements of your LCD. It's a bit difficult to photograph, but very easy to see with your eyes. You can see a similar effect by shining a flashlight directly at a dark LCD monitor. But it might also be possible that their reflections were too faint to pick up at the ISO and shutter speed you used. It is possible they could be teased out if you cranked the exposure in post processing. But reflections from the dimmer lights are so much dimmer than the light they came from, that they aren't visible. Thus, the other lights in your image actually do reflect off the sensor and back, just like the brightest lights. The coatings don't entirely eliminate reflections, but they to greatly reduce, or attenuate, the reflections. Some elements are coated, specifically to reduce reflections and therefore glare. Optical elements are very smooth, and therefore reflect specular (distinct) light. Note that every surface inside a camera and its lens reflects light. It's the 2D grid nature of your camera's sensor (like all digital cameras) that is causing the regular gridlike pattern. The light is then bounced back towards your sensor again, but greatly attenuated. The grid of rainbow flare is caused by strong light reflecting off your camera's sensor pixels, forward towards a surface (such as the rear element of your lens, or perhaps the IR filter over your camera's sensor if it is not bonded to the sensor's color filter array and/or microlenses).
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