advance planning for Atomos Shogun's 4K recording format with Sony A7s

[Nicholas Natteau]

According to Apple's white paper on the Pro Res codec, 4K Pro Res (Proxy, LT, regular, and HQ) has these Mbps rates (page 19 of the document):



Having never shot 4K Pro Res, can anyone (who has) tell me if there is any noticeable difference in image quality between Pro Res Proxy and Pro Res?
If not, I would rather shoot 4K 24fps in Pro Res Proxy at 145 Mbps (or Pro Res LT at 328 Mbps) than Pro Res at 471 Mbps.

 

[Policar]

Someone on the C100 forum posted this comparison:

http://www.mdma.tv/c100/noiseandprores.mov.zip

AVCHD, Proxy, LT, regular, hq, 444

And if you lift the mid tones so you can see the worst compression in the shadows:

AVCHD has the second most detail, but there's a little flickering from the I-frame compression.
Proxy is totally unusable. It's not intended for anything except proxies so...
LT is quite bad, maybe ok for web content.
Regular has a bit of macro blocking, useable but you lose shadow texture.
422 is ok, but macro blocking in shadows. (Fwiw, I have never seen macro blocking with it; to me it is perfect....)
4444 is near perfect.

I would use HQ for sure.