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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 :)

Speed ramping

Was the shot stabilized with smoothcam? Or is there heat coming off of the car or whatever that is in the foreground? There's a bunch of strange wavy motion in most of the 24 fps part at the beginning.
 
The wavy motion is what we like to call "dappled lighting".

What I said in the 'gimme a speed ramp box' thread notwithstanding, speed ramps are pretty cool!

For your next slow-mo test I recommend beaches and bikinis. Why stray from the classics?
 
No, it's not just the light. I think it's atmospheric like Chris said. It appears to be heat coming off of the car that gets magnified on the long end of the lens.
 
Yes, looks like heat signature to me...
Cheers,
Harry
 
So this is in-camera ramping?

Dude, BTW, huge missed opportunity... you should have set this to the Chariots of Fire theme... :)
 
Tom said:
So this is in-camera ramping?

Dude, BTW, huge missed opportunity... you should have set this to the Chariots of Fire theme... :)
Click to expand...

Or the theme from "The Six Million Dollar Man."
 
So while I don't have a Red yet, got one on the way, can someone explain to me how in camera ramping works with maintaining proper exposure. Do you just set a single shutter speed/angle and it maintains it or is there some other form of exposure compensation going on. For example if I start off shooting at 1/48th sec shutter speed at 24fps, will my final shutter speed be 1/240th sec at 120fps? or will it still be 1/48th? I'm guessing that if it stays constant that you would need to start that shot with the 1/240th sec so as to have a clean image for the higher frame rates.
 
Yes could someone chime in on the exposure question? Also will the camera allow stepping (going from 24fps to 120fps) without the smooth ramp?

thanks in advance.
 
As far as exposure, we just dialed everything in with the camera set to 1/48. Whatever the camera did with shutter speed (I assume it kept it constant because there's no brightness change), it didn't make it very obvious, and we didn't have time for really in-depth testing. It might matter which shutter speed mode you're using (e.g. normal vs. relative). Maybe things are more clear in build 15, which seems to have some new features related to the way shutter speed is displayed.

We'll be shooting more tests either tomorrow or Monday, probably with build 15, so I'll see if I can clarify this if nobody else chimes in before then.

As far as having the camera change frame rates instantaneously during a shot... there's no option for this in the menus. It should be possible to do with an external controller, once those are supported. (Or are they already?)
 
We were making shots like this on an ARRI 535A back in 1993 with the electronic controlled shutter. It wasn't all the rage until the 435 came out,
but it was all available on the 535A. So the RED shutter is not a physical shutter ? What controls the shutter angle ?
Also: that looks like light dapple to me, maybe reflected off the car.
 
Peter Sensor said:
So the RED shutter is not a physical shutter ? What controls the shutter angle ?
Click to expand...

Red's shutter is fully electronic. There isn't really a shutter angle per se, just a shutter speed. Presumably setting this changes the amount of time during which, for each frame, the photosites are allowed to accumulate charge before the camera reads them out. (As of build 15 the camera can report its shutter speed as an equivalent shutter angle, but this is just a convenience for the operator.)

Peter Sensor said:
Also: that looks like light dapple to me, maybe reflected off the car.
Click to expand...

There are two things going on. There's dappled light (there were trees over the street), and there's also some sort of atmospheric-looking effect right along the edge of the car in the foreground at the beginning of the shot. Neither looks like a camera artifact, so no worries.
 
Whats going on with the tree and his arms when he runs in front of that tree (at 16.5 sec-15 sec) It looks like very weird vertical skews on a 16 pixel array basis?
 
Shutter speed

Shutter speed

Chris Kenny said:
As far as exposure... It might matter which shutter speed mode you're using (e.g. normal vs. relative).
Click to expand...

It´s indeed shutter speed mode wich ajust how exposure will be handled in ramp... I´ve actually not tested (relative mode) yet but it is how it is explaned in the manual.

See you,

Pat
 
Shutter Control in Varispeed

Shutter Control in Varispeed

can someone explain to me how in camera ramping works with maintaining proper exposure. Do you just set a single shutter speed/angle and it maintains it or is there some other form of exposure compensation going on.
Click to expand...

The RED-ONE camera will always maintain a fixed shutter speed throughout a ramp, unless you tell it otherwise (opposite to a mechanically shuttered film camera)

So if in NORMAL shutter mode, the camera will maintain constant shutter speed for as long as it can - it can't maintain 1/48th of a second at 50 fps for example. If you switch to RELATIVE mode, then the shutter speed changes with the frame rate and you will get longer exposure times at slower frame rates and vice versa.
 
Awesome, thanks for that info everyone, especially Stuart, that is exactly what i needed to know. So in essecence if I wanted to maintain a relative shutter angle of 180 degrees throughout the ramp that is a possibility.
 
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