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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 :)

The Shutter Angle

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cinemano

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Okay i admit i heard shutters were at an angle.. but i never thought we could change it ourselves.. thats neat, but.. what for?

What are the reasons for changing the shutter angle..
Id love to know :) Should i just leave it on Auto?

What are advantages and disadvantages.. ?

Sorry for the silly questions, but the only way to learn is to not be afraid to make them :)
 
Shutter angle.

Shutter angle.

cinemano said:
What are the reasons for changing the shutter angle..
Click to expand...

Reasons to change:

1) Exposure, more than 180 gives you extra light, 360 is 1 stop +, less gives you less light 90 is 1 stop less, 45 is two stops less, 22.5 is three stops less, 11.25 is 4 stops less, 5.625 is 5 stops less, 2.8125 is 6 stops less.

2) AC Mains Flicker, when shooting at 24fps under 60Hz lights you can reduce flicker by shooting at 1/60th second which is about 144 degrees.

3) Blue/Green screen, to get a sharper edge you can reduce the shutter angle to about 5 degrees. This makes an unplesent effect on moton though.

It is best to keep the shutter between 270 and 120 degrees for most work to reduce "picket fencing" effect when the camera move relative to the subject like in a camera pan.
 
Also short shutter angles can be used to great effect. Saving Private Ryan beach scenes. Gladiator fighting. Lost first meeting with the others.

If you need printed material from your video, a small shutter decreases motion blur.

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Film a football match and running water with different angles to get a feel for it.
 
Changing the shutter angle relatively to a frame rate

Changing the shutter angle relatively to a frame rate

Changing the shutter angle relatively to a frame rate become quite a task.
Apparently you need to choose the display of the shutter at system>setup>preferences>shutter>degrees. I think it can be changed for varispeed only if it sets to degrees and not at 1/sec.
Then you have to go to sensor>shutter>speed and change it to the degrees you want. However I found out this doesn't cooperate so I had to make sure varispeed is uncheck and then recheck it or even go to time lapse>check enable and then uncheck it to "release" the shutter degrees and be able to control it according to the frame rate (varispeed) I want.
Has somebody came uon such a problem?
Has someone found a definite way to change the shutter angle in accordance to the frame rate?
 
Change the mode in the shutter menu.
From the RED Manual: "Relative: When operating in this mode, the Shutter Speed values are proportionately reduced
or extended to correspond to changes in the instantaneous capture frame rate. This mode is analogous to use of a fixed shutter angle on a film camera.
e.g. Enabling Relative mode with 1/48th sec shutter at 24fps will mean 1/96th sec for 48fps, and 1/16th sec for 8fps. This achieves the same visual result as setting a 180 degree shutter."
 
Micheal
This works on a frame rate of 25FPS what try doing it at varispeed mode and you will find it is not so simple.
 
We did a test this week with these settings:
Build 15
Project Frame Rate 24 fps
2K 2:1, RC 28 on CF Card
Varispeed 100 fps
Shutter mode relative 180 degree with changes to 12 degree

Worked fine here.

Maybe your problem is a different one which I just don't understand. In that case I apologize.

Cheers
 
well now it seems also to work here too, before it didn't...
 
now it stuck again. have to go through all what I described above again
 
Glad it worked out. :biggrin:
 
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