Many people avoid using a camera flash because it washes people out, creates harsh shadows, and usually overpowers the background of the photo. You want to take better pictures underwater so you need a diffuser for your strobe. The Sea & Sea Diffusers for YS-250PRO Strobe will give you better contrast and richer colors when taking pictures. The diffusers attach easily above and below the water. The Diffusers are made from Noncorrosive Plastic Materials. Use of the accessory diffuser softens the light and helps reduce backscatter. So take better pictures with a diffuser on you strobe. Use of the Accessory Diffuser Drops the Light Level; the Strobes 105° Degree Beam Angle is increased to 115° Degrees with diffuser and changes the Color Temperature of 5,600K to a Color Temperature w/diffuser of 5,200K. Diffuser is covered by a 12 month limited warranty.