Caution should be used when analyzing photos like this recent "boomerang" UFO. Note the motion distortions- especially the separate lower ring. Inset photo "A" is a reference showing no distortions due to motion or speed. Inset photo "B" represents extreme distortions due to the shutter speed be lower than "A". Both photos were shot using a fill flash. Inset photo "C" is an enlargement from "B". The front tire and rim in inset "C" illustrates interactions between shutter speed, forward motion, and rotational motion.