Well its been a while since i used the d200, but if there is a setting that will prevent the shutter from releasing unless it's focus locked use that. Also there should be a setting for continuous focus, and set it to use just one focus point.
Also, since you have more than open tank, if its possible, take some lights from some other tanks and blast the tank your shooting with light. also try to shoot when its dark in the room.
try the best you can to keep the camera parallel to the glass.
Also, since you have more than open tank, if its possible, take some lights from some other tanks and blast the tank your shooting with light. also try to shoot when its dark in the room.
try the best you can to keep the camera parallel to the glass.
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