Hi Genghis9,
4K video is a hell of a lot of data to work with, you need good (more expensive) SD cards, and a lot more of them, with 4K video, using 3 batteries and a p4p a 16 GB SD card needs to be changed. In just a few days on Malta, I recorded almost 128 GB video, and in Iceland even more. This means my iPhone and iPad quickly reach their storage limits, and at home, I need storage running into TBs. I use one of the faster professional Macs and that even has its problems with 4K video, makes editing an act of patience and increases the consumption of coffee (whilst waiting) to dangerous levels. At the end of the day, I do not even have a monitor that can fully display 4K video anyway.
I am not a commercial film producer and I doubt very much that my films will appear in the cinema, I recently asked myself why I make my life difficult and film now mostly with 1080 at the highest frame rate (depends on NTSC or PAL). I have made copies of most of my older 4K video to 1080 and boy did the computer run hot. Editing has become a dream and my coffee consumption dropped, my doctor is very pleased. 16 GB of 4K video goes down to about 3 GB after conversion.
Now still photos are another matter the higher the definition the better and it is a point to note that you can make a pretty good photo from a frame taken from a 4K video.
I do hope this reply is not to anarchistic for you.* *(personal remark to Genghis9).
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