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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 :)

Skew...

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Jannard

Jannard

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Skew is caused by quickly panning the camera during the shot or a very fast object goes hurtling by at a high rate of speed. In a film camera, it is caused by the shutter. Arri skew is different than Panavision skew. Their shutters enter and exit the frame from different angles. Remember the old race car wheel image?

In a CMOS sensor camera, it is caused by read/reset times. The longer the read/reset time, the more skew. Our sensor has a read/reset time much faster than most other CMOS sensors. It is a bit slower than a film camera. Which means a bit more skew than a film camera, but a lot less than other CMOS cameras. We have yet to find someone that found our skew objectionable.

Just like film cameras, the RED ONE comes standard with a little bit of skew during fast pans. If you want a lot... you have to pay extra.

Jim
 
Jim... you seem to be a little less shy now that you have passed the 500 post benchmark. Can you let us all get a word in edgewise?!? :usd:
 
Jannard said:
It is a bit slower than a film camera. Which means a bit more skew than a film camera, but a lot less than other CMOS cameras. We have yet to find someone that found our skew objectionable.
Click to expand...

As I've exampled before, film skew is a different animal than CMOS rolling shutter, as it does have a significant period of the exposure that isn't skewing at all. Therefore, better 3D tracking and matchmoving.

If the current proto REDs are being used to shoot VFX plates then we shoud soon have some answers from the VFX supervisors on those projects. If you're saying that this is already happened, then that is good news indeed.
 
Can the effect be reduced by increasing the shutter speed? I haven't had any problems in the work I've done but I have occasionally noticed this in theaters. Does this phenomenon appear (mostly) during projection rather than broadcast?
 
And Jim,

Helluva great Friday for news. Thanks for all the new technical threads. Lots of new info to sink our teeth into. I cant quite tell if its the second coffee or pure raw anticipation.
Probably both.
Like many people, I'm praying for stills grabs.
You guys must all be grinning like Cheshire cats.
So are we!

J
 
Has the skew been improved since 'Crossing the line' was shot or is the amount of skew visible in the downloadable clip what we can expect from the production cameras?

Thanks.
 
Zane Roach said:
Has the skew been improved since 'Crossing the line' was shot or is the amount of skew visible in the downloadable clip what we can expect from the production cameras?

Thanks.
Click to expand...

yes it has been improved immensely since Crossing...
 
I just saw Crossing the Line a few weeks ago at the FCS 2 Tour. I don't remember ever reading what the cause was, only that it had been fixed, so forgive me if this was already answered in April, but was the weird wobbly, stretchy stuff in some of the airplane footage caused by some strange effect of skew? Or something else entirely?
 
We weren't very far along in sensor settings for "Crossing". We are pretty close to being trained professionals now. :-)

Jim
 
Sensor settings...i dont know what that mean, but sounds interesting.

I thought the sensor was "what it is".

thanks
 
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