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Tuesday, 7 April 2015

Slow sync flash




Sheckly, photo 1
photo 2
In dark situations, you need a slow shutter speed to get enough exposure. (You also will use a wide aperture and high ISO setting to increase exposure). Also you often add light with the flash. But when you turn on the flash with an automatic setting on your camera, usually the camera goes no slower than 1/60s. In many cases that is not enough to get exposure from the background. For this, many cameras have a ”night photo” setting. Usually it has an icon of a building with a moon and/or star above it. This setting combines flash with a slow shutter speed. What happens is: things close to the camera receive flash, but the flash falls off quickly as distance increases, so the background does not receive flash. But if there are lights in the background, they can get exposure, because of the slow shutter speed. I never use this automated setting, I prefer to set the shutter speed manually. Those parts of the subject that are in the dark receive only flash, so they will be lit only very short, which means they will not render motion blur or camera shake. But the lights will be exposing for the full duration of the open shutter.

photo 3
I photographed model Sheckly in the night club Mustang Sally here in Blantyre. Thank you for posing, Sheckly. They have nice laser lights that move and flash and change colour and all that, exactly what you need for crazy effects of this kind. When the shutter stays open for, say, 1 second, the moving lights record as streaks in the image.
photo 4
In photo 1 you see Sheckly sharp, she received flash. On her face you see streaks of light. These green lights are small dots in reality, but because the shutter was open for a second, and they moved during that second, they become lines. In the background you see lights with similar shapes, which is probably camera shake, they all get the same shape lines because that is how I moved the camera in the second the shutter was open.
Photo 2 is a variation on this. In this case the red lines are laser lights moving by themselves. The strong coloured lights on top and at shoulder height are stationary lights, their streaks are caused by camera shake.
In photo 3 and 4 I used a shutter speed of 5 seconds. Here you see Sheckly sharp because she was lit by the short duration of the flash, and during the five seconds I deliberately moved the camera in a weird way to creates streaks of light. You see the lights in weird lines. Different types of camera
photo 5
movement create different types of lines. This is a bit of a hit and miss affair, you see that in photo 5. This photo it went wrong, I misjudged what would happen, and the lights are covering up Sheckly’s face in a weird way. Only good for humour, and here it is not even that great of a joke. Just to show you that it can go awfully wrong. So make a lot of photos when you use this technique, and your chances of being lucky get better.

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