Magic Filter - Magic Internal 50x50mm Filter (3Packs)
Read our review on Magic Filters
Product Overview:
The Magic Filter is designed to produce colorful underwater photos even without flash or lights.  This filter is not your ordinary red filter, they have made their filter from a unique formulation.  The filter recommended to be used up to 15m (although many photographers are happy with the results even up to 20m).  The 50x50mm filter is the one size fits all filter which can be easily be cut in to size of the lens.  Each pack comes with 3 filters.
Why Do You Need a Filter?
The point of a red filter is to compensate for red light loss which takes place under water. The reason being at about 10 feet there is no red light. The camera's white balance is thrown off because of the red light loss causing the camera to record colors which are too blue or too green. A filter compensates for the red light loss tricking the camera into recording natural colors the way you see them.