A flickr contact of mine put the following together. It will, I hope, interest the group:
A quick search through Flickr came up with the following... (1) A Mamiya 80mm f/1.9: http://www.flickr.com/photos/puja/2282039950/ (2) Yashica Electro 35: http://www.flickr.com/photos/jeffwyonch/1527193632/ (3) Yashica 35 cc (?): http://www.flickr.com/photos/silverfingers/1849617257/ (4) Yashica Electro 35: http://www.flickr.com/photos/lslphoto/1421172594/ (5) Mamiya c330: http://www.flickr.com/photos/91744974@N00/2057767850/ (6) Rolleiflex 3.5F: http://www.flickr.com/photos/saksak/690985963/ So, Elias, you are in good company! Many people with many different types of cameras have observed the same artifacts on their pictures. Indeed, the "cross" artifact in question shares somme common properties in each of these examples: it's located symmetrically across the optical midpoint of the the image; it has a one axis aligned directly toward the light source; and, it's surrounded by a ring of bright light, a common lens flare artifact. Multiple flares are possible, as shown in examples (2) and (5). The latter is especially nice since the top flare is likely from the reflected sun off the water's surface. I think that what you're seeing is most likely an optical caustic, caused by either internal reflections of, or refraction through, the lens elements. (http://en.wikipedia.org/wiki/Optical_caustic).
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