The most common flash accessory that you see other photographers using is a plastic flash diffuser and there is a very good reason for, they just work. A plastic flash diffuser is a semi-opaque device that is designed to fit your specific flash unit. They usually just snap into place and are really simple to use. Ideal for wedding or event photography, where you don’t have a lot of time to perfectly light each subject, the plastic flash diffuser scatter the light and diffuses the overall harshness of the light. In other words, it makes the light more flattering on your subject and removes deep shadows behind them. For the best results when time is a factor, simply point your flash at 45º and fire away.