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Post by Darren on Aug 8, 2010 23:17:04 GMT 10
While most orbs are circular in shape some can appear hexagonal, diamond, or triangular - amongst many others. When particulate matter, or an insect is close enough to the lens to be out of focus, reflecting brightly and at the right angle - it begins to take on the shape of the actual aperture of the lens. This varies from camera to camera. The precise shape of the aperture is determined by the diaphragm and how many blades are used to create it. You can play around with the online Iris Simulator to see the shape of different diaphragms. Slide the yellow slider to reduce/increase the number of blades and rotate as desired. If you scroll further down that page you'll see how the aperture shape can create some pretty cool effects - you may like to try to create star or cross shaped orbs! Another example - smiley faced orbs can be found at the lomography site.
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