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You will find the parabolas in these reflectors is not nearly accurate enough to be useful as a visual telescope.
I'm not sure what the manufacturing tolerances are for satellite dishes , but if they are parabolas with a few to several mm then I think you'll be lucky. OK for radio and microwaves , but useless for producing a sharp image from visible light where you need at least 1/4wave tolerance , take green light , that's an exceedingly small allowable error from a perfect parabola.
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