Depth of Field: is the range of distance within which the objects have the best focus and appear to be acceptably sharp.
Movement: movement in either your subjects or your camera, or both can blur the image significantly especially when using long shutter speed.
Working Distance: is the distance between the front of the lens and the subjects. FYI, how close is your camera to the subjects.
Automatic Flash Exposure: is a feature built in to many digital cameras. It may be inaccurate and can cause overexposure when working in a very short distance, i.e short working distance.
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