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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 :)

Red MX more sensitive in Tungsten

Richard N. Metzker

Richard N. Metzker

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I recently participated at a Red MX camera test with Kamal Derkaoui, csc. Kamal was testing the sensitivity between Tungsten and Daylight settings in the camera as well as the stop loss with a 85 filter. According to Red, the Red MX sensor is a daylight sensitive sensor, but Kamal found that the Tungsten setting was almost a stop more sensitive than the daylight setting. We were curious about the difference, and the fact that Tungsten was more sensitive. Also, we were wondering if anyone else has had a similar experience?

Settings
Red MX 30.5.0
View: Redcolor
ISO 800

Tools,

Grey Card
Arri Tungsten Fixture
Light Meter
Waevform Vector Scope
HD monitor
The Sun


Kamal can be reached at his website:

http://www.dopvision.com/
 
Just a hunch here, but as you gain channels in tungsten-ballancing, it may well appear so.

To test it, take the tungsten-shot and re-set to daylight in RCX or some other r3d tool and measure it through a waveform.

Also if something blows @ 800, you can esily roll back to 320 for post to reclaim blown highlights, and compensate with a curve.

Curiious if this approach is neccesary anymore with the new redlogFilm gamma, though...
 
Footage that is blown at 800 is also blown at 320, 160, or anything else. Changing the ISO will not preserve more highlights or give you more headroom. If it's blown, it's blown, and it's as simple as that. The sensor's RAW image is completely unaffected by the camera's ISO setting.

Unless I'm completely nuts here, that is.

:-)

Stephen
 
Blown is blown, but you can push it with ISO/exposure, and get it back with them if it is in fact not blown but gained out of range...
 
...and not forgetting they're only blown if they're blown in the RAW data...as you said, ISO is irrelevant and even though they may seem blown at 800ISO only by checking RAW and the built in meters will you know for sure. If they're not there is info there, but if clipped...there she blows!:)
 
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