Pocket 4k Media Choices

The place for questions about shooting with Blackmagic Cameras.
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Que Thompson

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  • Joined: Thu Jan 24, 2013 10:19 pm

Pocket 4k Media Choices

PostTue Jun 12, 2018 8:53 pm

Hey everyone!

I plan to shoot DNG 3:1 mostly, does anyone see an advantage of going with CFast over SD? I will also be using the 60p option a lot. I can see that SD is less expensive and CFast has higher top speeds, but are there any other caveats? Oh the sizes appear to be larger for CFast as well (256gb & 512gb).
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michaeldhead

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Re: Pocket 4k Media Choices

PostTue Jun 12, 2018 9:05 pm

I could be wrong, but I don't think SD cards allow for any raw recordings. I think you have to use CFast or an external SSD. My plan is to use an external SSD.
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Ryan Humphrey

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Re: Pocket 4k Media Choices

PostTue Jun 12, 2018 9:16 pm

Assuming the Hard Drive recording works as well as it should I can't imagine a situation where anyone with a rigged-up camera would record to anything else. I can see recording to a card if you are running super light, but anything beyond that and it's going to be HD all the way.
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michaeldhead

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Re: Pocket 4k Media Choices

PostTue Jun 12, 2018 9:28 pm

Checking the Blackmagic website again, it does look like you can shoot raw up to 30fps on high speed UHS-II SD cards. Hmm.... CFast is too expensive for me on a per-Gigabyte level, so I'm planning on the SSD option.
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Que Thompson

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Re: Pocket 4k Media Choices

PostTue Jun 12, 2018 9:32 pm

These are the advertised rates and 30fps:

4096 x 2160
CinemaDNG RAW - 272 MB/s
CinemaDNG RAW 3:1 - 129 MB/s
CinemaDNG RAW 4:1 - 97 MB/s
Apple ProRes 422 HQ - 117.88 MB/s
Apple ProRes 422 - 78.63 MB/s
Apple ProRes 422 LT - 54.63 MB/s
Apple ProRes Proxy - 24.25 MB/s

3840 x 2160
CinemaDNG RAW - 255 MB/s
CinemaDNG RAW 3:1 - 122 MB/s
CinemaDNG RAW 4:1 - 92 MB/s
Apple ProRes 422 HQ - 110 MB/s
Apple ProRes 422 - 73.6 MB/s
Apple ProRes 422 LT - 51 MB/s
Apple ProRes Proxy - 22.4 MB/s

1920 x 1080
CinemaDNG RAW - 66 MB/s
CinemaDNG RAW 3:1 - 32 MB/s
CinemaDNG RAW 4:1 - 24 MB/s
Apple ProRes 422 HQ - 27.5 MB/s
Apple ProRes 422 - 18.4 MB/s
Apple ProRes 422 LT - 12.75 MB/s
Apple ProRes Proxy - 5.6 MB/s

Looks like it should work with and SD UHS-II card just fine (I just doubled the numbers for 60fps). I guess, USB-C to SSD may be the best option, they're a lot less money. I just got a 500gb one for $115 at Fry's. I just like to be as light as possible.

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