If RED can do 60p @ 4k, why not 120p @ 2k??

Emery Wells

Emery Wells

Active member
Believe me Id be thrilled with 4k 60p, but thats really not slow enough for many "slow-mo" shots. You would still have to go to film for anything above 60fps. Theoretically the sensor should be able to handle 2k at 120p if it can do 4k at 60p.
 
Oh yeah, more than 60p would be much appreciated. What's the normal fps range in the celluloid world? I found some Arri's that do 1-60fps, but I know many famous scenes higher than that...
 
Yeah, but those are specialized cameras. What about cameras for feature films? What are fastest rates regularly used? Anybody got some info on that? Thanks :-)
 
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Purple said:
Yeah, but those are specialized cameras. What about cameras for feature films? What are fastest rates regularly used? Anybody got some info on that? Thanks :-)
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Most varicams shoot at a 1-50/60 fps and alot of the arri film cameras I see use the same frame system, an average camera usually isnt used for extreme slow mo shots its just not practical.
 
I've just finished a short on a combination of an Arri SR3 & D20. The SR3 had a maximum frame rate of 150fps - the D20 is rated for the same frame rate, but there isn't an available recorder that will run at that speed. I believe the Arri 435 is also a 150fps camera.
 
do a search in the cafe, i posted a link ot a camera that takes somethign like between 60-2000 Frames a second. at 1024x1024, for laboratory purposes. like thoes famous footage of a bullet going through an apple. I believe you can tune in any frame rate you desire. between 60 and ~2000
 
I must admit that would be cool to have. But how much and when it comes out are still unknown. So we have to trust our good buddy Jim and just wait until NAB.:)
 
Only problem I would see, is it would confirm we aren't getting an optical viewfinder. If they can do >70 or so FPS, I'm guessing a mechanical shutter, would start to get really really expensive.
 
im.thatoneguy said:
Only problem I would see, is it would confirm we aren't getting an optical viewfinder.
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I hope you're wrong. Critical focusing without an optical viewfinder but with a 4k image would be virtually impossible without expensive monitoring equipment.
 
Actually, the RED ONE can do 120fps at 2K. But I think it's only through RED-RAID. Not RED-DRIVE or RedFlash. I believe Stuart English just gave us an update on the frame rates at different resolutions?
 
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Remember that the 2K data rate won't be precisely 1/4 the 4K data rate - it will be slightly higher than that. More precise compression [read: larger file sizes] is required for lower resolution imagery. To phrase that differently, artifacts that won't be apparent at 4K will potentially be apparent at 2K.
 
the camera will shoot 2k 120p, but it's tricky to record and we can't record that via REDCODE internally.

As for viewfinder, it's an EVF, so no problem there, and it's very focus-worthy, and has a superb focus assist to help even beyond that.

Graeme
 
Re: REDCODE scaling- The compression format itself is no doubt independent of frame rate, that's just a number/flag in the bitstream; just as you can create an AVI at 1 fps or 999 fps (though your system may not play the 999 fps one correctly :-). The hardware that implements the RAW->REDCODE video processing, maybe FPGAs, has some performance limit and sounds like 2k/120fps is beyond it. Hardware performance is always improving though, so no doubt in the future, chips will exist to handle it.
 
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ZaneIsNumber1 said:
Stuart's latest on available frame rates and how they can be recorded:
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Internal / Local : (REDCODE to RED-FLASH or RED-DRIVE etc)

4K RAW @ 1 - 30fps

2K RAW @ 1 - 60fps

2K RGB @ 1 - 60fps

1080p @ 1 - 60fps (Generate 1080i if desired from a 1080p recording)

720p @ 1 - 120fps



External / Remote : (Uncompressed RAW to RAID via High Speed Data port)

4.5K RAW @ 1 - 60fps

2K RAW @ 1 - 120fps

The max record rate stated over SATA is 60fps.... What we haven't updated is 720p over SATA can go up to 120fps...

For 1080p at 120fps, your path is to capture 2K RAW at 120fps external to the camera over the high speed data port, and extract 1080p from RAW using REDCINE.
 
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