Question. Why are my vertical images underexposed? Here are 2 images as examples. Shoot the same subject horizontal and vertical and only the vertical's are underexposed. This was with using the lightsphere II clear with flash aimed at the ceiling in both orientations. I took the lightsphere off and used plain bounce flash and the vertical is still underexposed but not as much. Using a Rebel XT with 380ex II flash and low white ceilings (I live in a trailer).
Any solutions or ideas as to why this is happening and how to stop it is greatly appreciated.