Why am I getting a double image instead of motion trails in a shutter-drag self-portrait?
Asked 1/7/2018
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2 answers
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I’m trying to create a shutter-drag style self-portrait with a compact camera. I can only use first-curtain sync, and I don’t have an external flash available. Instead of seeing a smooth trail as I move through the frame, I’m getting two more distinct exposures of myself.
My settings were:
- shutter: 8 seconds
- aperture: f/7.3
- ISO: 100
Why does this happen, and how can I get a visible trail rather than just a double-image effect?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
7
I would imagine that the transition between point A (standing there) and point B (close-up) was too fast. A good indicator of this is that you waited for some seconds at point A and then quickly moved to point B to again stand still for some seconds; try to move continually, only stand still at points that should be articulated.
As Ian Lelsie points out in the comments, it would be best to choose an exposure time that is just as long as your transition will take: so if you want to have a clearly visible trail of yourself walking from the left to the right of the frame, and you know that this walk will take you around 4 seconds (in a decent walking speed), then you should choose an exposure time that is about the same (say: 5-6 seconds, perhaps longer if you want some "stationary ghosts" on the way or at the beginning/end).
Another tip, commented by Robin, is to wear clothes that are brighter than your surroundings - or have surroundings that are darker than your clothes. Also, you could use less ambient light and use some light source that is pointed (only) towards you. As light decays with increasing distance to its source, this would work best if the walls/surroundings are further away from you than they are in your picture above.
With a flash and a very dark room (which will not be convenient to get around), you could also do non-photoshopped multiple exposures. That said, it will be safer for you and your furniture to use Photoshop or GIMP and start composing it if that is an option to you.
Originally by user69369. Source · Licensed CC BY-SA 4.0
user69369
8y ago
0
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You’re likely only recording yourself clearly at the moments when you stay still. If you stand at point A for a while, move quickly, then stand again at point B, the camera captures two stronger “ghosts” instead of a continuous trail.
To get a trail, move continuously during the exposure rather than pausing for long at the start and end. The movement itself needs to last long enough to register across the frame.
A good approach is to match shutter time to the movement: if the walk or motion takes about 4 seconds, use roughly a 5–6 second exposure rather than a much longer one. If you use 8 seconds but only spend a short part of that actually moving, you’ll mostly get two stationary impressions.
So, for more obvious trails:
- keep moving smoothly through the frame
- avoid standing still too long unless you want emphasized “ghost” positions
- choose an exposure time close to the duration of your movement
Without flash, this effect depends entirely on ambient light and continuous motion, so timing matters a lot.
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