Initial data
A. G. was outside taking pictures of mother-of-pearl clouds (polar stratospheric clouds) and one of his photographs appeared somewhat triangular translucent objects.
The report FOTOCAT Report # 4 noted: the fact that this effect appeared only in one photograph from the series, which he removed, what makes us assume this is an artifact of the digital camera.
Translated by «Yandex.Translator»
Original news
15 December 2003, 16:16 – Songdalen, Kristiansand A.G. was outside photographing nacreous clouds (polar stratospheric clouds) and in one of his photos there appeared a number of similar-looking inverted Tshaped “things.” The fact that this effect only appeared on one photo of the series he took, makes us consider this to be a digital camera artifact.
Hypotheses
Defects in old photos
There are a number of defects specific to film images. They are connected with the peculiarities of the film and principle photo.
The film in essence is a strip of transparent synthetic plastic, supported on her a photosensitive layer of chemical substances that can alter its transparency or properties under the action of light.
Re-reflections in lens lenses from a strong light source
The lens consists of a set of lenses (in some lenses - of mirrors), designed for mutual compensation of aberrations and assembled into a single system.
From the contour light (bright light sources behind the subject or next to it), caught in the frame or located outside the frame, parasitic reflections from the internal elements of the lens are formed, called glare (or in slang "hares").
Objects and light sources out of focus
When the objects are out of focus, their silhouettes blurred and poorly recognizable. They can look like dark or colored translucent stain. This is often the cobwebs, spiders, insects in front of the camera.
Investigation
Resume
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