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HD vs 4k
Realistically, you should always shoot at the highest quality you can. You can always
downgrade to a lower more manageable quality footage afterwards, but you can't upgrade.
4K renders a cleaner image across the board so would ideally be the best. Additionally, if
shooting at night, always shoot in 4k.
That said however, there are problems inherent with working at higher resolutions and they
can be project breakers if not thought about in advance.
Such an example is hard drive space; 4k footage takes up a tremendous amount of space,
depending on the format and codec. Not only that, but they would require proxy files in
order to edit with. Proxy files can take up (+/-) 2 times the space of the original files, which
would mean a lot of hard drive space is required.
The specification of the computer being used to edit on is also a factor as well as the editing
software itself. A slow computer could take days or more to create proxy files depending on
how much footage you have.
Then there is the export process which again, if you have 4K source footage, could take a
very long time with a slow low spec computer, potentially days.
Another thing to do is try using an Atomos external monitor to take advantage of the higher
bit rate (10bit vs 8bit), although it doesn't carry many benefits save being wrapped in 422
codec; although this does get you a better colour profile. The noise produced is of a very
similar level.
Creative Media Centre
15
Sony A7 III Settings Guide
David Turner
October 2019