2/20/2023 0 Comments Balancing flash and ambient light![]() If you are at full power and still need more flash, open the aperture by a stop or two. So aperture has a direct effect on the amount of flash hitting the sensor. I know that it's hard under the pressure of a shoot to remember what to change to increase or decrease the amount of ambient light in your photo. Full power, although longer than ½-power, is still much narrower than the camera's sync speed. The second thing you should notice is that the each is just a sliver of the width of the frame. The first thing you should notice is that the higher the power setting, the longer the flash burst. The green line is the flash duration of a 580EX II at 1/2-power The red line is the flash duration at -power. The width of the black box represents -the sync speed of many Canon DSLRs. This is much faster than your camera's sync speed (typically ). Here's why the shutter has no effect on the amount of flash getting through: a Speedlite's longest duration of flash is produced at full power-which is reported by Canon to be. If you shoot faster than your camera's sync speed, you are not reducing the amount of Speedlite flash hitting the sensor rather, you are only reducing the portion of the sensor that is exposed. I know it's hard to believe, but it's true: as long as you are shooting at or slower than the sync speed for your camera, then shutter speed has no control over the amount of Speedlite flash hitting your digital sensor. Why Shutter Does Not Control Flash Exposure The key is to use a faster shutter speed if you want to dim the ambient and a slower shutter speed when you want to collect more ambient (typically in dim light). ![]() So, if you can't get your head around it, then just accept these truths and get on with shooting. If you overthink it, you'll fall into the trap that has confused legions of photographers. Use the aperture to control the flash exposure.Use the shutter to control the ambient exposure.If you can come to understand the following, you will have mastered one of the hardest concepts about flash photography: ![]() Learn More Buy Controlling Ambient In Flash ExposuresĪs a Speedliter, there will be times when you want to accentuate the role of ambient light in your photographs, and there will be times when you want to minimize the role of ambient light in your photographs. Speedliter's Handbook: Learning to Craft Light with Canon Speedlites ![]()
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