I recently learned about the proposed FOCAL telescope, which would use the Sun's gravity as a lens to observe exoplanets (or whatever it's aimed at) with incredibly high resolution. Obviously, the Sun is more convenient for this purpose than a black hole, but would it be reasonable to use the same principle to turn a black hole into a megatelescope? How would it compare to, say, a 1 AU diameter parabolic mirror in deep space?
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