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Anonymous
You ever seen pictures taken where it's not a fisheye, but everything seems to curve a little out to the sides? That's called barrel distortion. It's something that happens with lenses, especially wide angle ones. When it goes into the center, more common with telephoto lenses, that's pincushion distortion.
Lens designers, with know-how and good materials and technology, have corrected these distortions in good lenses to the point where they're just plain not noticeable at all, and even in middling modern lenses they're barely there.
Fisheye lenses forego correcting this to fit a non-rectangular, hemispherical scene onto a rectangular plane, the film/sensor. What your guy is probably trying to say is that the lens has a high amount of barrel distortion, which not knowing the right terms to use, he calls it a "fisheye effect."
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