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Ry7777

Answer: Fisheyes are almost always used for underwater photography where there are no straight lines to worry about.                                                            They also produce sharper images with brighter colors than a rectilinear lens.  Depending on your composition, a fisheye can be used to enhance the curvature of the earth

Explanation: I don't know why you are using it. sorry.

Answer:

Hi! It is because they are mostly used for underwater photography and video recording where there are NO straight lines. They produce "sharper" images with bright colors than a rectilinear lens and can be used to enchance the curvature of our Earth. Hope this helps!