Cameras to shoot video with slow shutter?
- Thread starter shooter_
- Start date
Not any... 1/30 for example, yes. OP meant lower than that... Like that video, I guess.
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Ebrahim Saadawi
Carbonite Member
The shutter speed cannot be lower than the frame rate. Physical impossibility. When you're taking 30 frames each second, each frame could only be exposed as long as 1/30 of a second, just common sense.
So, if you want to shoot at a lower shutter speed, say 1/15, you would need to shoot at 15 frames per second. Want to shoot with a 1 second shutter speed, then you'd need a frame rate of 1.
When you shoot with a frame rate lower than 24, say 15, if you play it back at the same speed of 15, the video will look choppy, and if you play it at standard speed of 24/25p, the video will be sped up, like a timelapse.
As for cameras that can do it, a 200$ 550D + Magic Lantern can shoot down to 5 second exposure (0.something FPS). I use this for timelapse a lot.
So, if you want to shoot at a lower shutter speed, say 1/15, you would need to shoot at 15 frames per second. Want to shoot with a 1 second shutter speed, then you'd need a frame rate of 1.
When you shoot with a frame rate lower than 24, say 15, if you play it back at the same speed of 15, the video will look choppy, and if you play it at standard speed of 24/25p, the video will be sped up, like a timelapse.
As for cameras that can do it, a 200$ 550D + Magic Lantern can shoot down to 5 second exposure (0.something FPS). I use this for timelapse a lot.
But video?
Same effect like in that clip shot on a7rii?
(my GH1 only shoots video with not so much slow shutter... 1/30 fraction of a second!)
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Hearnia
Active member
How would you guys mimic Danny Boyle's half speed effect? He uses it a lot in his films and in the intro he did to the 2012 summer olympics:
https://youtu.be/p7YHDfLxZi0?t=23s
It almost looks like you could delete every other frame and achieve it.
https://youtu.be/p7YHDfLxZi0?t=23s
It almost looks like you could delete every other frame and achieve it.
deltoidjohn
Veteran
Many video cameras will let you shoot at a lower shutter speed, and then the camera will just duplicate frames to fit the frame rate. So you end up with, for example, a 25p file where each exposure lasts for 5 frames.
In fact of the cameras I've tried this with the Canon DSLR's are the only ones that don't allow it. Any Sony mid-range video camera (NX5, NX3, FS700, EX1/3, etc) should do this with no problems.
My GH1 only 1/30 in movie mode... a7rii can do 1/4. Any information on the RX10ii?
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GrahamH
Well-known member
That's not necessarily correct. Several cameras I've owned can record (say) a 1/15 shutter to a 1/30 video clip. The signal from the sensor is accumulated into buffer for the full 1/15s, then recorded as identical images on two successive frames.
Edit: I just checked and my Panasonic G7 does exactly this. I shot 1080p60 at 1/10sec - there resulting clip has sequences of 6 identical images (each with 1/10 motion blur) played back at 60fps.
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DPStewart
Veteran
lovecameras
Carbonite Member
Annoying News Shooter videos where a third of the video is logos.....yawn....change the tape.
Barry_Green
Moderator
Yep, this is how it's done in many/most pro video cameras. All the Panasonics that I can think of offhand support shutter speeds down to 1/2 second.
Barry_Green
Moderator
Ebrahim's not wrong, and neither are you, you're just saying it differently. Ebrahim's exactly correct that you cannot have a shutter speed slower than the frame rate. And you're correct, the way the camera copes with that dichotomy is by buffering the frames. The result is duplicated frames, but at the frame rates that Ebrahim said. If you shoot at 1/2 second exposure, you cannot create more than 2 frames per second. If you record at 60p, you'll end up with (as you discovered) 30 identical frames in a row (29 duplicated frames for every unique frame). Which, in effect, is two distinct frames per second -- which is all the camera can create, when using a 1/2-second shutter speed.
The frame duplication is an issue for recording, not imaging. In terms of how many unique images the camera can produce per second, that is strictly limited by the shutter speed. The camera cannot create more unique images per second than the shutter speed allows for.