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Yongnuo Announces New AF Assist Accessory for Canon Cameras
Most speedlights come with an AF assist beam, this beam helps your camera focus in low light. Nikon and Sony cameras also have an AF assist beam built into the bodies, Canon cameras however, do not. So, if you are a canon user, the only way to get the benefits of an AF assist beam is to have a big speedlight on your camera. At least, it used to be.