ahsanford said:Left field idea: any possibility that the 5D4 is designed that it will record 4K but Canon simply blocks that feature with firmware to prevent undercutting Cinema EOS sales?
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Interesting thought and there's two parts to the answer.
They could take that route, but it also requires a significant amount of engineering on their part to really accommodate video recording. First, the camera CPU has to be fast enough to process that amount of pixels. Second, keeping in mind that 4K is four times the amount of raw thoroughput of 1080p (or 2 if you cut the framerate), that processor is going to be running significantly harder than it would normally. You need to make sure you have the necessary cooling/heat dissipation mechanisms in place to handle that so you don't damage electronics. Third, the sensor has to be able to output that imagery to the CPU in a time short enough that it doesn't take too long (lest you get bad rolling shutter effects). Fourth, pulling extra pixels means the sensor will require more power and run hotter as well - there has to be sufficient cooling in place to handle that as well otherwise you'll either end up with lots of extra noise or damage the electronics/sensor.
So - the short answer is... the raw functionality may be there and something like a Magic Lantern could "enable" it. But the actual result would be less than optimal or potentially cause damage.
There's a good bit of engineering that goes into enabling that sort of functionality and unless they were planning on including it as a feature in the camera, that's a lot of wasted engineering dollars to engineer it all in and not use it.
So, I'd bet they wouldn't engineer the functionality in unless they planned on using it.
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