 Rachel Larson |
Canon 550 Flash causes double image in low light I shoot weddings with a Canon Rebel XTi as my workhorse and a Canon 550 Flash. I notice that when the light gets low, I often get a slight double image or a ghosting effect on the edges of a subject. I primarly shoot in AV mode and the ISO is adjusted for the light. What is causing this? What can I do to avoid this? Any advice would be greatly appreciated. Thank you in advance for any feedback. Rachel J. Larson
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
Av mode with a flash will get you a slow shutter speed for the low light for one image and the flash will cause the main image. Keep the camera or the subject steady if you need the slow shutter speed to let the ambient light bring out the background, or bring your sync speed up to cut down the ghosting. Either method, the camera needs to be steady.
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Christopher A. Vedros |
In addition to Greg's advice: There are some cases where you can't keep the subject steady, like when people are dancing in a darkened room. The ghosting effect can sometimes give nice results that show motion, but it will work better if you set your flash to second curtain sync. This is Custom Function 9 on the XTi. If you want to freeze the motion and have no ghosting, switch to Manual, set your shutter speed to 1/60 or higher, use your aperture to control depth of field and exposure to the background. The flash will do its best to control the exposure. If the subjects closest to your camera are getting overexposed, use a smaller aperture or lower ISO. This will be a trade-off since it will also reduce the exposure of your background. Sometimes you can't have it all. Good luck, Chris A. Vedros
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