What happened was your camcoder was on auto focus and when the sky was empty it would go into search mode trying to focus on something.
Shut off your autofocus and do it by hand. You can set it for infinity because the fireworks are far enough away that you should have no problem.
RU
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New DCA videos; one for each 'Land'
Sunshine Plaza, A Bugs Land, Hollywood Back Lot, Golden State, Paradise Pier
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