Decent non-expensive camera for cinematic filming?

I need a camera that 'at least' will work just as well as the Canon 70d. Just a camera for pointing and shooting. My price range is at least under 800 or 700. I tend to do a lot of fast movement and under extreme desert sunlight and cloudy weather. Sometimes maybe at night.

I know I'm gonna be suggested a dslr from canon/nikon/sony etc. And believe I know how well they work but I need a camera right that'll work just as well as them.

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Nikon D7100 focusing issue?

I recently upgraded from a D3100 to a D7100; however, I'm finding the D3100 better and am very very disappointed with my D7100.

Here's the problem. I'm an automotive photographer and the D7100 rarely focuses on what I want it to. When shooting cars the car is out of focus or focuses on the people inside. It's extremely annoying.

I shoot AF-C with a 50mm 1.8 / 35mm 1.8 - the camera is new and so are the lenses so it is in perfect condition.

Could someone please advise - thanks

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