Exposure differences in Redspace and Raw view

[Lauri Kettunen]

Some posts on this forum has suggested the head room of Redspace is about 1/2 stop. With build 16 I check the exposure with the Raw view and have discovered (that outdoors) the head room of Redspace in very much image dependent. I think even witnessed a difference around 3/2 stops. Can't yet say what was the exact difference for I was filming bears during the sun set and thus had very little time to record technical details of the camera. Yet, I've also seen that sometimes the difference between Redspace and Raw view can be very small. The difference is measured by "shooting on the right" and making sure none of the color channels clips.

It seems if there is evening or morning sky in the image, that tends to make a big difference. As well, while filming late in the evening and early in the morning noticed that with long 400mm and 600mm lenses the difference between Redspace and Raw was much bigger than with a 80-200mm zoom although no framing included the sky.

It would be handy if the metering could be set to show the raw view while otherwise the image were shown in Redspace. I think Mark from Offhollywood already suggested somewhere this, so I second here his request.

 

[George A.]

Normally, I found that the difference from RAW VIEW to REC 709 is 1/2 stops, and from RED 709 to REDSpace another 1/2 stops. So, from RAW VIEW to REDSpace the difference is - in most situations - 1 stop. Yes, there are variations to that, depending on the time of the day and the lenses you use.

I always expose to the right. But, due to being able to lift the shadows without too much noise in Build 16, I ETTR based on the REDSpace histogram (I even allow one channel to clip in the traffic lights), knowing that most probably I have one full stop of headroom on the sensor (I always double-check the RAW VIEW as well).

 

[Wade McDonald]

Just as a quick workaround, in the last two shoots I've configured one of the user buttons on the side of the camera (the one that defaults to color balance) to switch between raw and redspace, so I can quickly switch to the raw histogram and back. It worked very well and we had perfect exposure every time.

Also worth saying that this last beta build matched my light meter perfectly, although I ended up fudging the exposure on a couple shots to protect the highlights a touch.

 

[Martin Jäger]

..i'm doing it the same way as eastco. have one user button asigned to switch between raw and redspace. in redspace i let it clip sometime aswell.

martin

 

[SF Geek]

I do what wade does. you don't need to calculate the difference when you can just switch between the two and see exactly for yourself. I use redspace for checking mid and low tones and raw to check highlight headroom.

 

[George A.]

As I mentioned before, having the ability to toggle between different functions (cycling) on a single user button would make this even simpler.

Example:

User button 1: you're in REDSpace; press once, you see RAW VIEW; press twice, you see REC 709; press again, you see false color; press again, you see REDSpace again (the beginning)

User button 2: you're in normal view; press once, x2 zoom; press twice, you see edge color; press again, you see focus assists; press again, you see focus overlay; press again, you're in normal view

And so on with other buttons/functions. Of course, they should be user-programmable.

 

[J. Eric Camp]

I personally wouldn't like a cycle.

Also note that your difference between REDSPACE and RAW will be changed by your meta data.

 

[Lauri Kettunen]

Yes, I also have the Raw view programmed into one of the buttons. The slight inconvience is, the Redspace view is brighter and more pleasant to view. But, to set the exposure correctly, one has to swicth to the Raw view. It's bit a slow approach and clumsy if the light changes while you shoot and/or move the camera.