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Kit lenses are not top quality, but good enough for normal everyday photography.
This is obvious on starfield photos where stars away from dead centre of the frame are not round and small at maximum aperture, so you have to close it down to f4 - f5.6 or even lower to achieve good result.. however that depends on individual criteria for "good" and of the purpose of taking images... Totally distorted star images are still good for photometry - which is quite serous work and could provide results of high scientific value.....
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