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Long Exposure Time-lapse Essentials

COW Blogs : Richard Harrington's Blog : Long Exposure Time-lapse Essentials
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In order to capture a moving street shot, I turned to long exposure. To really see the lights and energy of the scene, I wanted to elongate the action.  Here’s the logic I applied to the shot.







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  1. First I set the camera to manual mode to avoid any significant settings changes from shot to shot.  With timelapse, you want to see variation over time, so the last thing you want is an aperture or shutter changing.
  2. Next I stopped the camera all the way down and shot ƒ/22.  This let the least amount of light into the sensor.
  3. I set the shutter speed to create the sense of motion.  In this case I found that 2.5 seconds was enough for the look I wanted.  People and cars standing still (at the intersection) were relatively clear, while those in motion became a long streak.  I also wanted the lights to take on a starburst.
  4. Lastly I refined the ISO to achieve a proper exposure. In this case a value of ISO 800 was needed to get the shot.  This was due to the smaller sensor of the OM-D E-M1 and the fact that I was stopped down so small.






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Once the shot was done, assembly was easy.  We’ve covered these techniques already on Photofocus.  Here’s the highlights of my workflow.







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  1. I used Adobe Camera Raw to develop the files and sync the same settings to all images.  In this case a slight Clarity and Curves adjustment helped.  Noise reduction was also used.
  2. An image sequence was created.
  3. The image sequence was imported into Adobe After Effects.
  4. I interpreted the sequence at 12 fps (half the frame rate I needed).
  5. I stretched the image to 200% and turned on frame blending. This forces a motion blur between shots (essentially a series os short dissolves) to emphasize the streaking.
  6. I used keyframes to create a zoom on the shot.

All in all, post processing was only 10 minutes to create the shot.  I am happy with the end results and continue to explore using smaller apertures and longer exposures when shooting timelapse shots of nighttime activities or subjects that involve water or wind.

 

For more on photography, be sure to check out Photofocus.com




Long Exposure Time-lapse Essentials Republished by Richard Harrington


Posted by: Richard Harrington on Dec 5, 2013 at 6:00:00 amComments (1) AdobeDSLR VideoVideo

Comments

Re: Long Exposure Time-lapse Essentials
by Carlo Ferraro
I got nobody to ask for my query (EOS forum no answers) so I ask for your help.
I started playing with time lapse with a Lumix FZ200, that does pretty good but has some serious limitations. I did long time ago on Super 8 films and later on a Sony VX1000.
I purchased a Canon ES 700D and here re my problems.
1- No way to lock up the mirror on a time lapse session but only for one picture at a time.
2- Jumps on video levels
With the Lumix I fixed the iris and iso and let the camera set the speed that varied sometimes very much during a sunset (AV). The result was smooth.
With the the EOS it does not work, the changes in illumination followed by speed adjustments are noticed on the rendered movie.
Of course I could shoot manual trying to anticipate the exposure at late sunset but then at the beginning it would be saturated.
Any help would be appreciated.
Thanks
Carlo
Sony NX5U, Imac Quad 16GB ram, 3.4GHz, 2GB graphics
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