What does Shutter speed do in live view mode?

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amer369

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Can anyone explain what shutter speed does while in live view mode. The physical function of a shutter makes sense when talking about still shots, but for video?

Tried searching for the answer without much luck.
 
What camera all are different, edit suppose just default for your camera would be more thatn likely fine, depends what you want to be honest
 
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It's a d7000, I just wanted to know the function of the shutter speed when shooting video. I think Canon also has a live view mode, I'm sure the principle would be the same regardless of model.
 
No, the frame rate is selected within the menu setting eg 24fps or 30fps. But once set your able to adjust aperture (which makes sense as just as in still photography it refers to the amount of light the lens allows in) and the ISO (which also makes sense as it adjusts the sensors sensitivity to light making it easier to expose in low light conditions).

What doesn't make sense is shutter speed when shooting video. I can adjust it in live view and as in still mode it changes the exposure of the image in the display screen. Just wanted to know how it does this . I'm sure if its set to 1/100 it doesn't mean the shutter is opening and closing 100 times per sec. Does anyone have the answer?
 
Think of video as a series of stills. If the frame rate 60fps then 60 stills are shot per second, they each have a shutter speed. That's an over-simplification, but you get the gist of it.


.. ..and Live View is not the same as shooting video, getting terminology right avoids confusion.. ..
 
amer369 said:
No, the frame rate is selected within the menu setting eg 24fps or 30fps. But once set your able to adjust aperture (which makes sense as just as in still photography it refers to the amount of light the lens allows in) and the ISO (which also makes sense as it adjusts the sensors sensitivity to light making it easier to expose in low light conditions).

What doesn't make sense is shutter speed when shooting video. I can adjust it in live view and as in still mode it changes the exposure of the image in the display screen. Just wanted to know how it does this . I'm sure if its set to 1/100 it doesn't mean the shutter is opening and closing 100 times per sec. Does anyone have the answer?
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What it means is that every frame in the video will be exposed for 1/100th of a second, so e.g if your shooting at 24 frames per second you'll get 24 frames which were each exposed for 1/100th of a second. Assuming a 180 degree 'shutter angle' (look this up if you don't know what that is) which is the usual standard, the 'shutter speed' is simply twice that of the frame rate e.g 24 frames per second = 1/48th. Nothing says that you have to use a shutter angle of 180, its just a trade off between motion blur and smoothness, and tighter/looser shutter angles can be used for creative effect.
 
s162216 said:
What it means is that every frame in the video will be exposed for 1/100th of a second, so e.g if your shooting at 24 frames per second you'll get 24 frames which were each exposed for 1/100th of a second. Assuming a 180 degree 'shutter angle' (look this up if you don't know what that is) which is the usual standard, the 'shutter speed' is simply twice that of the frame rate e.g 24 frames per second = 1/48th. Nothing says that you have to use a shutter angle of 180, its just a trade off between motion blur and smoothness, and tighter/looser shutter angles can be used for creative effect.
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Yeh it makes sense now, thanks. Thanks also Alastair.
 
@s162216 ,,but what is the shutter actualy doing when using video mode ? it cant be running at 30fps ,,,so does it open and have a rotary shutter as well ?
 
The shutter stays open, the each frame is a read of the sensor.
 
donut said:
@s162216 ,,but what is the shutter actualy doing when using video mode ? it cant be running at 30fps ,,,so does it open and have a rotary shutter as well ?
Click to expand...

What happens is exactly what @Alastair says above.
 
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sorry to be so thick , but are you saying the shutter opens and closes sixty times per second ?
 
donut said:
sorry to be so thick , but are you saying the shutter opens and closes sixty times per second ?
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No.

Alastair said:
The shutter stays open, the each frame is a read of the sensor.
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Shutter opens, the sensor is read 60 times per second. Shutter closes when you stop filming.
 
ok thanks for that , ,,,so is this the way digital sensors will be going in the future ,,,,,not having the "normal" shutter set up but a more electronic shutter ?
 
donut said:
ok thanks for that , ,,,so is this the way digital sensors will be going in the future ,,,,,not having the "normal" shutter set up but a more electronic shutter ?
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It's been done (an early Nikon DSLR and some csc's and a lot of compacts IIRC), I don't know why it's not done more often on DSLR's, it's brilliant for flash sync speeds.
 
donut said:
ok thanks for that , ,,,so is this the way digital sensors will be going in the future ,,,,,not having the "normal" shutter set up but a more electronic shutter ?
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It's not quite the same as an electronic shutter.

Tbh, I didn't really know the answer when the original question was posed. I've just maintained a steady one Google search ahead of you all the way through the thread. It's a professional skill, I'm a consultant. There are some really good guides on the web to how digital video works (and how shutters work) that go into as much depth (or not) as you need ;)
 
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