Beyond one's preference for low light sensitivity vs 4K, there are a number of other tradeoffs to consider when determining which of the two is best for you.
Like “rolling shutter.”
It's a short but interesting piece.
Why can't manufacturers just give us everything we want for cheap?
Rolling Shutter: Sony A7s Compare to Other Major Players; Meh…
Via DIY Photography:
One of the things that cinematographers care about when selecting a camera for shooting is how significant is the rolling shutter effect.
Rolling Shutter is a ‘side effect where vertical lines in the real universe appear as diagonal lines ‘on film’. For example it smears buildings when shot out of a moving car or create a jello effect when the shooting camera is unstable, we explained this in length in this post.
The good guys at Cinema5D took the crown challenger – Sony A7S with its remarkable low light performance and put it to the test against some of the other leading video cameras in the market: Arri Amira, Panasonic GH4, (Canon C300), Canon 5D mark III and Canon 1D C. Sadly it did not do all that well.
First here is a simple visual explanation of the effect caused by rolling shutter:
This is how a rolling shutter ‘scans’ an image
Resulting in smeared diagonal lines:
How the test was done?
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(cover photo credit: snap from DIY Photography)