ISO -Green Screen

[Paul Harding]

RED ONE MX.
When lighting a green screen, what is the best ISO to use.

Do you set your meter to 320 ISO, or set the meter to whatever you choose to shoot at?

Paul

 

[Eki Halkka]

RED ONE MX.
When lighting a green screen, what is the best ISO to use.

Do you set your meter to 320 ISO, or set the meter to whatever you choose to shoot at?

Paul

I've done quite a bit of keying from ISO 800 tungsten MX footage. Works fine, even though there's a tiny amount of noise/grain. If you shoot ISO 320, especially daylight, the footage should be pretty much as clean as it gets.

Just make sure you don't clip highlights (there's more headroom at higher ISO).

 

[Paul Harding]

Thanks Eki.

I am shooting inside with daylight lights I have read somewhere on this site you should use a blue filter in front of the lens.

Also when metering for that aperture do you set the meter to the base ISO 320 or set it to, say 800 if that's what your using
paul

 

[Gunleik Groven]

If you have daylight, the blue filters are not neccesariy. It can work very well in tungsten, too (without the gel'ing) especially since B30/New colorscience...

Do some tests, if you have the chance...

 

[Hans von Sonntag]

Thanks Eki.

I am shooting inside with daylight lights I have read somewhere on this site you should use a blue filter in front of the lens.

Also when metering for that aperture do you set the meter to the base ISO 320 or set it to, say 800 if that's what your using
paul

When shooting under daylight a blueish tungsten to daylight filter such as an Tiffen 82 series is not needed because you are under daylight already.

For exposure I would recommend to set the viewfinder to raw, expose in such a way that highlights (not reflections) don't exceed the histogram on the right and close the aperture for half a stop.

When talking about highlights I don't mean reflections you get by using back- and rim-lights but those created by the key-light(s). A typical highlight is a bright part on the actors forehead or the white collar of hers/his shirt.

Hans

 

[Paul Harding]

Thanks guys I am will be testing later on today.

I had some bad results since going MX. thats why I am looking for more info.
I had done pretty well before the upgrade.
I shot the last one with MX at 500 ISO and the image is really poor.

Paul

 

[Eki Halkka]

I shot the last one with MX at 500 ISO and the image is really poor.

How exactly? You should get rather pristine results @ ISO 500.

 

[Paul Harding]

I could send you a still if you would like to look,

Paul

 

[Clint Lealos]

Hey Paul, I had a thought...were you by any chance using build 30.5? I remember there being some problems with the blue channel on build 30.5. It showed up as blotches of missing info in the blue channel only and was causing problems with keying on green screens.

Make sure you are using build 30.6, set your meter and camera to the same ISO (I would use 800), set your custom white balance, keep your green screen at about 50 IRE (false color is great for this) and you should be golden.

Good luck and let us know how it goes

 

[Paul Harding]

I just downloaded the latest firmware and although it's the same as I had originally after the upgrade the picture is looking a lot better. Can't explain it.

Paul

 

[Clint Lealos]

Strange, but good news. Happy shooting Paul!