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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Scarlet X Data Sheet

Martin Beek said:
I'd be very interested to know with what resolution and compression ratio some of the top cinema productions were shot (with the Epic), such as Spiderman, Contagion and others.
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Hi Martin,

I can't speak for every motion picture that has used EPIC material, but it was mentioned that Spiderman was mostly 5:1 I believe. I would say from my own experience that 5:1 through 8:1 is nice for theatrical/VFX use.
 
The chart shows max compression ratio so if it says RC 5:1 in the chart that means 5:1 all the up to 18:1.
 
Deanan said:
The chart shows max compression ratio so if it says RC 5:1 in the chart that means 5:1 all the up to 18:1.
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Deanan - Does that mean there could be some additional, higher frame rates available as firmware progresses - or do I have that backwards; more compression means more load on ASICs?
 
Roy_R said:
Anyone see any test of anyone testing a Canon 17-55 2.8 EF-s on Epics?
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Suitable for 4k on Scarlet X, I believe it vignettes at 5k on Epic/Scarlet X.
 
Phil Holland said:
Suitable for 4k on Scarlet X, I believe it vignettes at 5k on Epic/Scarlet X.
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Agreed, it is a designated APS-C lens so makes sense, it will probably be a good documentary lens with Image Stabilizer. I was sitting and day dreaming of interesting configurations today that I could run with the Scarlet once it arrived and while I was looking at your charts something occurred to me. Wouldn't it be a viable option if shooting 3K to use Micro 4/3 lenses to compensate the crop factor? Besides getting wider angled lenses designed for the format the camera weight and size would be minimally affected. Would this be a viable option for that crop factor and resolution? Imagine throwing a Panasonic 20mm 1.7 on a canon adapter. It would look like the camera barely had a lens at all...
 
Phil, can't thank you enough for doing all this. Hugely helpful!
 
Whats the most you could get out of a 64GB SSD at 2k? I guess that would be at 18:1 right? How is the image at that point?
 
Tim Nitsch said:
Whats the most you could get out of a 64GB SSD at 2k? I guess that would be at 18:1 right? How is the image at that point?
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At 24fps?

2048Hpix * 1080Vpix = 2.2Mpixels/frame
2.2Mpixels/frame * 12bits/pixel = 26.4Mbits/frame
26.4M bits/frame * 24frames/sec = 634Mb/s
634Mb/s / 8bits/byte = 79MB/s
79MB/s / 18 = 4.4MB/s
64000GB / 4.4MBps / 60s/min = 242min = 4hrs

Rule of thumb for 18:1 on 64GB SSD, ~1hr at 4k, which means 2hrs at 3k (half as many pixels as 3k) and 4hrs at 2k (half as many pixels as 3k).

In 2k, you are recording ~35Mbps 1080p which is similar to a lot of prosumer 4:2:0 cameras, though most of them have the benefit of temporal compression and the detriment of having to fit in color information which is 50% more pixel information. Then again REDCODE is 12bit so that is 50% more information to compress as well, but these are all hard to compare so I'd test it out for yourself. 2k is already a bit soft, and 18:1 wavelet may make it a bit softer.
 
Thank you for taking the time to explain that for me Noah, I really appreciate it!

I understand quality wise 18:1 is not what you want to shoot at, but every once in a while we'll run into a situation where we need long recording times but are not in a location that would allow us to dump the cards.

Obviously more, larger cards would solve that but to start out that's not in our budget. So we're just seeing what our options are.
 
Noah Yuan-Vogel said:
No, Epic/Scarlet have 16bit ADC which is an improvement over R1, but all REDCODE is recorded at 12bits.
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I guess I am confused. Here is what the Epic manual says:

"The digital image received from the sensor is formatted as a pixel defect corrected (but in all other aspects unprocessed) 12-bit, 14-bit or 16-bit per pixel RAW data frame."

And this from the Scarlet spec sheet: "16-bit RAW Processing : Compression choices of 18:1 to 3:1"

What am I missing? I sense an opportunity to learn something here! :smiley:
 
Terry VerHaar said:
I guess I am confused. Here is what the Epic manual says:

"The digital image received from the sensor is formatted as a pixel defect corrected (but in all other aspects unprocessed) 12-bit, 14-bit or 16-bit per pixel RAW data frame."

And this from the Scarlet spec sheet: "16-bit RAW Processing : Compression choices of 18:1 to 3:1"

What am I missing? I sense an opportunity to learn something here! :smiley:
Click to expand...

I have asked this question before. I'm guessing recorded bit depth is tied to compression ratio choice, haven't seen anything about it being user selectable.
 
Ok I thought REDCODE was always 12bit but the ADC was improved but now you have me questioning it, perhaps Epic/Scarlet does use a 16bit versions of REDCODE? Searches of several other threads covering the same topic still give no conclusive answer from RED.
 
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