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There would be nothing wrong with that scope except it would be a real bu**er to move around. With that focal length the central obstruction should be tiny so it would have great contrast - good for the moon and planets, especially when equatorially mounted and tracking so you can get some nice longer exposures.
In the old days (1800s) it was quite common for the scopes to have these really large focal lengths, much easier on the eyepieces of the day, but it would be a bit like looking down a piece of water pipe.
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