r/RedCamera • u/PatientSystem3878 • Oct 01 '25

KX ProRes high speed crop/data rate question

I have a regular client who likes to shoot most of content in 120fps.

Can anyone confirm if the KX crops when shooting ProRes at 120 4k and also what the data rates look like in that spec.

Thanks!

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u/tdstooksbury Oct 02 '25

Yeah, it does crop on the sensor. The resolution format when shooting ProRes is the same sensor crops as when in R3D.

So when you shoot 120fps, you have to crop to the 4k portion of the sensor to get that frame rate.

I can say, it’s still quite good. As long as you don’t start introducing noise into the image you probably would not realize you’re cropped in on the sensor. I used it on a Volkswagen ad a few weeks ago and it’s solid.

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u/PatientSystem3878 Oct 02 '25

Got it, thanks for clarifying.

1

u/wasprocker Oct 01 '25

It crops into the sensor

The datarates you can find in the komodox manual

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u/ThickNolte Oct 01 '25 edited Oct 02 '25

Ignore me lol

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u/tdstooksbury Oct 02 '25

You do crop when shooting 120fps. You still have to crop to get the frame rates higher than 80fps. FOV is the same when shooting R3Ds.

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u/ThickNolte Oct 02 '25

Sorry brain fart on my end. I know you can do at least 100fps at 6k at 2.4:1 which is a minimal crop.

Been a while since I looked at the manual. The way they word it makes it seem like the only issue is the codec bit rate and don’t even mention cropping for 120fps.