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A lot... the a7S is the first generation, while the a7III is the latest version (the a7RIV just came out) the ISO range is much wider on the a7S so it produces better low light and night shots, but the a7III has a greater Megapixel sensor (12 v. 24).
Sorry, there was a problem. Please try again later.Hi Difference, You may check out the specifications of these cameras instead to see their overall differences: https://www.sony.com/electronics/support/res/manuals/4537/45379401M.pdf (89) https://www.sony.com/electronics/support/res/manuals/4732/7e0b79aa9597d876d6854dd1ee0fd597/47329501M.pdf (83) Regards, Vincent
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