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e. The reflectivity of your subject will cause some areas to appear
brighter than other areas. For example, dark coral needs more
light than would white coral. Adjust flash intensity accordingly.
f. The further the flash head is away from the camera lens, the
bigger will be shadows due to the angle of light (flash) in relation
to the subject. The closer it is, the more backscatter you
may see in your image caused by small particles in the water. If
you have absolutely clear water without plankton or sand, you
may move the flash head closer to the camera lens.
g. In order to eliminate unwanted shadows you may consider these
two suggestions:
i. Remove the flash deflector (clear water only)
ii. Add a second Digital Flash.
5. Flash arm is loose and does not maintain correct aiming
position.
a. Soak the arm in warm fresh water and flex the arm until all links
are clean and free of detergents or lubricants.
b. Never use detergents when cleaning the flash arm.