What major drawback for general use accompanied the Keplerian design's advantage of a greater field of view?

Answer

The image was inverted (upside down)

While the Keplerian design offered a much greater field of view, a significant drawback for terrestrial observers was that the image produced was inverted or upside down.

What major drawback for general use accompanied the Keplerian design's advantage of a greater field of view?
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