Naturalists’ Tournament

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Presentation transcript:

Naturalists’ Tournament International Young Naturalists’ Tournament 13. Shining orbs Serbian team 1 Regional Center For Talented Youth

13. Shining orbs Bright and rather unexpected white disks may appear in a photo taken with a flash in a dark room. Explain why such shining orbs appear in the photos.

How does a camera work? Device that captures the image of an object Image is formed by using lenses Lenses focus the object creating sharp and defined picture First of all, it is important to explain how does a camera work. Camera is a device that captures the image of an object. But before capturing, it needs to form an image by using lenses. So when we have an object the image is formed on the film by going trough lenses which goal is to focus the object. And it is done using basic optical physics as you can see on the image.

How does a camera work? In focus

How does a camera work? Off focus

What are shining orbs? Unexpected, usually circular artifacts that occur in the photos when small particle is close to the lens, and strongly shined by light Off focus = Blurred Close = Larger Shined by light = Very bright

Particles Liquid Solid Dust Water droplets (rain) Pollen Mist Insects Sand Snowflakes

In which conditions do they appear? They appear in dark surrounding because of using flash Can appear anywhere only if flash is used

Why do they appear in the photos? The flash illuminates particles that are drifting very close to it Retro reflection “The circle of confusion” Retroreflection is the phenomenon where light is reflected directly back to the source Also, particle can be projected behind the focused object which makes the effect called The circle of confusion or CoC.

Examples Experiment 1: Dirt particles in focus 3 inches No shining orbs

Examples Experiment 2: Dirt particles off focus 3 inches Shining orbs

Remark

Thank you for your attention!!! Shining orbs = Ghosts??? :D