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Hi Cworth, The only huge difference is the type of Back-light these tv have. The 900F has Local Dimming and the 850F has TYPEFrame Dimming. You may use this link to compare our TV models: https://www.sony.com/electronics/tv/t/televisions?view=compare Thanks, Zac
Sorry, there was a problem. Please try again later.The major difference between the two are that the 900F uses local dimming as opposed to the 850F using TYPEFrame Dimming.
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