When so flash fires, the entire sensor is open and exposed all at once. What is important to know is your camera’s “sync speed.” Your sync speed is the fastest shutter speed you can use that when the first curtain reaches the other side, and the flash goes off, the second curtain has not started to cover the sensor. The flash is triggered when the first curtain reaches the other side of the sensor. Most small format cameras have focal plane shutters, which consist of two curtains, one travels across the sensor, opening it to light, and the other follows, covering it up, kind of like a scanner. We control the exposure only with the aperture. The flash duration can be 1/1000 of a second or shorter, so different shutter speeds will not change the exposure of the flash. Since flashes put out a good amount of power in a very short time, our exposure technique is different from ambient. The first part of this technique is having an understanding of how flashes work. It was necessary to light him both for balancing exposure and also for flattering light. The ambient on him was terrible, but the spot lights on the photos were interesting and dramatic. The photo that is used for this article is of my husband, Lee Varis, in a gallery. But with a little bit of understanding, you can effectively use this technique with any camera and flash in manual, not just the dedicated flashes on TTL. Some cameras have a function called “slow-sync” that works with a dedicated flash on TTL and automatically reads and figures the proper shutter speed. Strobes put out a powerful amount of light so, in order to balance with the ambient light, we need to use a long shutter speed, hence “dragging the shutter.” There is quite a lot to know about this technique because it involves color balance as well as exposure balance.
Balancing flash and ambient light portable#
For example: taking a photo of someone outside at night by using a portable flash and also capturing the city lights in the background. Dragging the shutter is a technique that balances the exposure of strobe and ambient light sources in one photo.
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