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:
One similarity between Sci-Fi and Opera is that both include storytelling
Two differences between Sci-Fi and Opera are
1. Sci-Fi is usually more science based while Opera is more romantic/emotion based
2. Opera includes dramatic emotional songs while Sci-Fi usually doesn't
Explanation: