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Old Jan 2, 2003, 3:34 PM   #1
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Default For Steve, webmaster - barrel distortion and pincushioning

Hi Steve,

Could you please explain what you mean by barrel
distortion at full wide angle and pincushioning at
full telephoto?

Ideally, if you could supply two pics to illustrate
the phenomenon that would be great!

Thanks much, Steve!
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Old Jan 2, 2003, 7:20 PM   #2
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I'm not Steve, but these are generic terms in both photography, and computer monitors...this page (further down) has examples of both pincusion and barrel distortion:

http://www.htu.tuwien.ac.at/~sascha/ptguide/01.htm
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Old Jan 3, 2003, 10:19 AM   #3
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Thanks, that illustrates it perfectly. Barrel distortion is most common in wideangle lenses and produces pictures that are curved outwards mostly on the right and left sides. This type of distortion absolutely ruins architectural photos unless you like that kind of semi-fisheye effect.

Pin cushioning is usually much less apparent as we tend to be interested in the center portion of the picture when we're using full telephoto zoom. This is exactly the opposite of barrel distortion, the left and right sides are now bent inwards to some extent.

-Steve
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Old Jan 3, 2003, 6:12 PM   #4
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Thanks, Steve and Mike Peat .
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