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Nex Video Mode Timelapse??

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richg101

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I was playing around with the nex 5n on video mode and realised a potential interesting feature. when you set video mode to full manual, you can set shutter speed to slower than the frame rate. ie. 25fps video but shutter at 1/4 sec. this means each 6 frames are exposed by the same 'shutter' movement (to make it simple to grasp).

so if we shoot a static scene like a landscape for 29:50 on this mode then speed it up to the speed we want, the camera is in effect taking 4 photos each second (for a total of 29mins!) thats a lot of shots and will cover a beautiful sunset or sunrise.

whats great is that in this mode we have benefits of long exposure (keeping iso's down) and the blurring of fast moving clouds also adds smoothing to the footage when sped up 4x.

obviously we have to live with the compression artifacts, but video on dslr's is never as good as stills.
 
richg101 said:
I was playing around with the nex 5n on video mode and realised a potential interesting feature. when you set video mode to full manual, you can set shutter speed to slower than the frame rate. ie. 25fps video but shutter at 1/4 sec. this means each 6 frames are exposed by the same 'shutter' movement (to make it simple to grasp).

so if we shoot a static scene like a landscape for 29:50 on this mode then speed it up to the speed we want, the camera is in effect taking 4 photos each second (for a total of 29mins!) thats a lot of shots and will cover a beautiful sunset or sunrise.

whats great is that in this mode we have benefits of long exposure (keeping iso's down) and the blurring of fast moving clouds also adds smoothing to the footage when sped up 4x.

obviously we have to live with the compression artifacts, but video on dslr's is never as good as stills.
Click to expand...
I'm assuming you used a ND filter to get the shutter speed that low? Lowest I got with my d300 timelapse was 1/200, and that was fully stopped down, base ISO.

http://matthewdurrphotography.wordpress.com
 
El Matadurr said:
richg101 said:
I was playing around with the nex 5n on video mode and realised a potential interesting feature. when you set video mode to full manual, you can set shutter speed to slower than the frame rate. ie. 25fps video but shutter at 1/4 sec. this means each 6 frames are exposed by the same 'shutter' movement (to make it simple to grasp).

so if we shoot a static scene like a landscape for 29:50 on this mode then speed it up to the speed we want, the camera is in effect taking 4 photos each second (for a total of 29mins!) thats a lot of shots and will cover a beautiful sunset or sunrise.

whats great is that in this mode we have benefits of long exposure (keeping iso's down) and the blurring of fast moving clouds also adds smoothing to the footage when sped up 4x.

obviously we have to live with the compression artifacts, but video on dslr's is never as good as stills.
Click to expand...
I'm assuming you used a ND filter to get the shutter speed that low? Lowest I got with my d300 timelapse was 1/200, and that was fully stopped down, base ISO.

http://matthewdurrphotography.wordpress.com
Click to expand...
for daytime you would certainly need an nd filter, even at f22 and iso 100. at night, dawn or dusk its not a problem.
 
Great catch!

Were you able to confirm that the exposure is really 1/4 and not clipped at 1/25? In essence that it is not a user interface bug?

An example would be great!

----------------------------
Ex-Tee-Eye * 50 1,8 * 17-85
En-Ee-Ex-5 * 16 * 18-55 * 55-210 * CV 35 1,4 * FD 50 1,4
 
RustyKnee said:
Wouldn't speeding up a normal shutter speed video have exactly the same result though?
--
Why do people call lenses copies? Why not buy a real one?

http://www.flickr.com/photos/rabbitstu77/
http://500px.com/RabbitStu
Click to expand...
you would think so wouldnt you. its strange.

consider this. set your cam on a tripod.

1. set it to manual mode 1/25 sec, f11, iso 400(or whatever is required, but keep shutter at 1/25 sec). now start video recording at 24fps or 25fps (depending on region). a few seconds will do.

2. stop recording the movie and then take a single still shot at the same exposure.aperture/iso as with the video.

3. adjust the shutter to 1/4sec then start recording again.

3. import the three files into your pc (two movies, one still) then open the first movie file (1/25th sec) in vlc. take a screen grab of one frame (it will be stored in documents/my pictures folder). now compare the vlc screen grab with your still image you too with the camera. almost exactly the same aren't they:) obviously the screen grab is a little compressed and is only a 1.5mb image, but resize the still image to the same and they are both usable for online viewing.

now do the same vlc screen grab on a frame taken from the 1/4sec shutter video. when playing the video it will be jolty (because each 6 frames are exposed by one shutter movement. but when comparing the stills the 1/4 sec shot will still be brighter than the still from the video shot at shutter 1/25th. and this is with the same iso and aperture. fast moving objects will be blurred, but when spe up to 4x or more they will become smooth again:)
 
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