Phones nowadays have cameras that are so perfect in quality, yet security cameras are mostly always so grainy so why? You can get a phone with a perfect extremely high quality camera for a few hundred these days, sometimes even less
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Higher resolution equals large file sizes. Have you ever recorded an overnight video on your phone? Try it and see how many gigabytes it consumes. Security cameras need to have good enough resolution to fulfil their basic function (identity if a person is breaking in etc.) but still keeping data storage as small as possible.
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