Don Haines said:.....
Look at a 60D...it can handle 1920x1080 no problems.... it can read the sensor 60 times per second no problems...
To go to 2K video at 60 frames per second you will need twice the computing power (easy) and probably 1.8X the storage speed (easy with a good card)
To go to 4K video at 30 frames per second you need 4X the computing power (easy) and probably 3.5X the storage speed (could be done with a fast compact flash card, SD is out)
To go to 4K video at 60 frames per second you need 8X the computing power (easy with dual Digic5+ or dual Digic6) and around 7X the storage speed. SD and compact flash are both out.... it will have to be cFast or something else...
You could reduce storage requirements by compressing it more heavily, but if you do, there goes quality.... and if you do not have quality, why bother with 4K video in the first place?
If the 7D2 supports 4K video, odds are very high that it will take a cFast and an SD card for storage...
Don, I really like so many of your posts here, they are clearly worded, well formatted & thoughtfully written. The above is one great example.
I have seen 4K (in a specialist store, on top end equipment), and it's great... particularly if the screen is large. I do think 4K will be something more mainstream- ie wealthier households in the west will be having it more commonly in the next 5 years or so (but it will probably be somewhat of a delayed take-up).
What I do wonder, is where is Canon (& other manufacturers) seeing (or 'making') the bottleneck? If the above is true, and 4K has historically been unachievable due to card write speed? CFast sounds like a possibility (as does USB3) for Canon's next 'higher end' / XD (ie single digit series) of cameras... eg 7DmkII, or 5DmkIV, or ID___
I have a 7D, and enjoy it immensely, but I only use video very rarely. I prefer taking / making still photography to videos myself, though I appreciate good video that others take/make.
If Canon will come out with clean, great 60fps 4K video, I do expect it will probably be on their 1DC or dedicated video body range, and then 'trickle down' to the 'normal' DSLR range.
Let's see what the future holds... in the meantime, enjoy your photography / videography!
Paul
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