I have some binoculars made from 50mm F1.8 camera objectives. I use them for looking at the milky way with 24mm panoptics ( 2X and 34 degree field).
I'd say don't spend too much time or money on them - the 12mm or so used aperture at 2X is pretty uninspiring.
Its amazing how much more detail you can see at 2X but due to the small aperture you will lose interest pretty quickly I would predict.
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