HTC One M8 User Manual page 163

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Zooming: Minimum zoom level
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Continuous shooting: Not supported
Lighting
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Use Duo camera in an environment where there is a good light source. Post-processing
effects for Duo camera do not work for low light photography or when you're using the
camera flash.
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If lighting is uneven, like when the background is a little bit under or overexposed, touch
> to adjust the exposure settings.
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Hold your phone so that you don't block the second camera lens.
Composition
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Match your subject with an interesting background. Positioning your subject with some
lights or a garden in the background will add color and distinction to your photo,
especially if you'll use the UFocus™ feature in Gallery. See
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Post-processing effects for Duo camera may not work if your subject and background
are too close or when you're taking a close-up shot. So, mind the distance between your
subject and your background, as well as the distance between the camera and your
subject.
Camera and Video
Duo Effects for details.
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