Sony a7 III Руководство - Страница 10

Просмотреть онлайн или скачать pdf Руководство для Цифровая камера Sony a7 III. Sony a7 III 19 страниц.

Camera 2 Settings:

Movie 1:

Exposure Mode:

Choose Manual for best control.

Can also choose from: Program Auto / Aperture Priority / Shutter Priority

File Format:

XAVC S 4K - 3840 x 2160

XAVC S HD – 1920 x 1080

AVCHD (50i 17M(FH) or 50i 24M(FX) – 1920 x 1080

XAVC S 4K or HD are best. Remember you can always downscale to HD,

whereas you cannot upscale HD to 4K, due to the pixels being increased in

size, the resolution will be poor. That said, 4K is a vastly more intensive

process to work with in post-production and requires extra work in order to

utilise properly.

If you do shoot in 4K, remember the file sizes are very large, and due to the

codec used - (H.264), you would need proxy files to edit with. Although one

thing to note; Due to the vast amount of data being uncompressed, Proxy

files are generally bigger in size than the original files. You will need a large

amount of hard drive space; at least 1.5 to 2 times the size of the original files

at a minimum, by the time you have the original files and proxy. That is with a

proxy resolution of roughly 960x540, down from 3840x2160, which is fine to

edit with, but if you go bigger on the proxy resolution, your hard drive will

need to be 4 to 5 times bigger.

XAVC S is recorded in H.264 which uses 'Long GOP compression' to compress

a high amount of data in to a small space. Which is why it being very

processor intensive is difficult to work with due to the high amount of

information being uncompressed. Hence, the best way to edit this type of

file, is to transcode it or create proxy files in another file format such as

CineForm or ProRes.

A good option is set the A7 to create its own proxy files whilst shooting. As

creating proxy files can take a lot of time depending on how much footage

you have. So, unless you have a very high spec computer, you will be waiting

for it to finish before you can begin editing. The only drawback with this; is

when shooting at 4K; you can get 40 minutes of footage on each card in the

A7. So, backing up footage and re-using the cards on set may be required.

One more thing, if you do create proxies afterwards, make sure the aspect

ratio is the same. Otherwise you'll get framing issues when editing.

Remember, Ultra-High Definition 4k has a different aspect ratio to full scale

4K.

Creative Media Centre

David Turner

Sony A7 III Settings Guide

October 2019