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Old Aug 2, 2009, 8:22 PM   #1
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Default Image Distortion Question

Please humour me - my family is having a little discussion about some colour distortion in a picture and since we don't know much about cameras, I thought here's the place to ask.

Here's the picture in question:




There's some pink/purple distortion in the top middle.

Anyone know would/might cause this?

The camera used was Sony DSLR A350 with a Sony 18-55mm lens.
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Old Aug 2, 2009, 11:21 PM   #2
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This appears to be a phenomenon called lens flare. In this case, it seems to be caused by the sun being above, and just out of the picture. Strong light, striking the front lens element at an angle, interacts with the lens coatings, and will sometimes also cause reflections and out-of-focus spots elsewhere in the picture.
Usually, the lens hood which came with the lens, if one did, is the best preventer of this, as it blocks the light at those angles which would cause it. Many times, filters in front of the lens will cause this type of problem or make it somewhat worse. Often, zoom lenses exhibit it more than fixed focal lengths.
In any case, this example, since it only seems to show the primary flare, indicates some very good lens coatings and an overall very good lens. Just try to remember to use the hood, and keep the sun a bit more out of the frame.

brian
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Old Aug 2, 2009, 11:53 PM   #3
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Thank you for the info.

If you can believe it - my stepfather took the picture and my mother thought it was the image of a ghost.

Sigh. <:
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Old Aug 4, 2009, 9:52 AM   #4
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Quote:
Originally Posted by DParker View Post
Thank you for the info.

If you can believe it - my stepfather took the picture and my mother thought it was the image of a ghost.

Sigh. <:
I agree with Brian - that is a classic example of flare. It can happen even when using a lens hood, though that will cut out many of them.

Let us know if your mother ever lets go of the idea it is a picture of a ghost.
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Old Aug 4, 2009, 8:11 PM   #5
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Let us know if your mother ever lets go of the idea it is a picture of a ghost.
You guys helped set her straight. I imagine it will only be a matter of time before she sees the Loch Ness Monster in a picture...
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Old Aug 7, 2009, 1:29 AM   #6
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A little bit of googling or youtubing will show that there are an astonishing number of ghosts and angels appearing in digital pictures these days.

Funny thing is how they seem to appear in exactly the place where photographers would expect to find flare.

Apparently ghosts and angels are sneaky that way.

Ain't a thing you can do to change the mind of a true believer. :-)
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