I WORK IN PROFESSIONAL VIDEO AND PHOTO ...IF THERE IS ADAQUATE LIGHT IN THE AQUARIUM TANKS, YOU WILL NOT NEED THE FLASH...TURNING OFF THE FLASH MIGHT NOT BE THE ANSWER THOUGH. IN PLACES LIKE THE TERRORS OF THE DEEP IN SEA WORLD, THE TANKS ARE WELL LITE BUT THE PLACE WHERE YOU ARE STANDING IS DARK. THIS MIGHT TELL YOUR CAMERA TO TURN THE FLASH ON EVEN THOUGH YOU HAVE IT OFF. THE SOLUTION IS SIMPLE. I JUST CAME BACK FROM DISNEY WITH 1000 PICTURES. I ONLY HAD 3 FLASHBACKS AT OF ALL OF THE SHOTS TROUGH GLASS. WHEN TAKING THE PICTURE, COVER THE FLASH WITH YOUR FINGERS OR HAND. THIS WILL PREVENT ANY SHOT OF FLASHBACK. IF YOU ARE USING A 35MM CAMERA AND NOT DIGITAL, BUY FILM AT ATLEAST 800 SPEED. 1600 IS BETTER,BUT IS OVER KILL AND IS REALLY EXPENSIVE.
FOR THE PLANE .. IT DEPENDS, FLASH OFF MOST OF THE TIME BECAUSE IT HAS NO FOCUS OBJECT. A NIGHT FLIGHT IS FLASH OFF . ALL U WILL SEE IS A BUNCH OF LIGHTS ON THE GROUND. DEFINITLY 800 SPEED FILM FOR THIS ONE.