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I found a picture from my camera archive 2012, which I need explanation about. It looks like either something happened to the camera or a certain light was captured.

light

  • "raw" would only be relevant if this artifact (probably perfectly ordinary lens flare) was invisible or notably different in the jpeg or tiff file. – rackandboneman Feb 28 '19 at 9:59
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    I redacted the email address for quick damage control. Not a good idea to post personal email addresses in cleartext here, you'll get drowned in spam. – rackandboneman Feb 28 '19 at 10:02
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    Possible duplicate of Mysterious signs or easily explainable artifacts? – xiota Feb 28 '19 at 10:38
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    Visiting Angel left a feather behind? – xiota Feb 28 '19 at 10:45
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It looks like a caustic, a shape that is produced by refraction of bright light at curved surfaces, most prominently when curved in more than one axis. Glasses filled with a clear liquid frequently show such effects, but even an empty drinking glass or bowl can do so.

To me it does not look like a lens flare at all. Most importantly you can see the shape conform to the recesses in the wall or ceiling.

Addendum: It might be produced by reflection from a strongly curved surface as well.

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This looks like flare from the lens. This happen when the light source is close to the angle of view of your lens.

Lens flare refers to a phenomenon wherein light is scattered or flared in a lens system, often in response to a bright light, producing a sometimes undesirable artifact within the image. This happens through light scattered by the imaging mechanism itself, for example through internal reflection and scattering from material imperfections in the lens. Lenses with large numbers of elements such as zooms tend to exhibit greater lens flare, as they contain a relatively large number of interfaces at which internal scattering may occur. These mechanisms differ from the focused image generation mechanism, which depends on rays from the refraction of light from the subject itself.

Flare manifests itself in two ways: as visible artifacts, and as a haze across the image. The haze makes the image look "washed out" by reducing contrast and color saturation (adding light to dark image regions, and adding white to saturated regions, reducing their saturation). Visible artifacts, usually in the shape of the lens iris, are formed when light follows a pathway through the lens that contains one or more reflections from the lens surfaces.

From the observation of @xenoid it can be also caused by water drop on the front element of lens.

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    It could also be that the flare is being projected onto the wall from another source and that is why the photo was taken (capturing an interesting effect) - I don't see much of a reason to photograph the wall otherwise, but then again, I wasn't there... – Kat Feb 28 '19 at 13:23
  • Lines look a bit distorted, as if the light was some drop of water. – xenoid Feb 28 '19 at 21:20
  • @xenoid, interesting, it can be also reflection from water drop on the front element of lens. Will add it in the answer :) – Romeo Ninov Mar 1 '19 at 6:10

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