So I am slowly buying everything I will need for my first weeding shoot. I have a new Rebel XSi. Do I need both the external flash and diffuser? or will the diffuser work, and or would just the speed light work? The wedding will not be in a church but a room with lots of beautiful french doors so there will be natural light and out side pictures before hand. With that information, what will I need? I am doing this for a friend, I have to start somewhere...lol... please and thank you in advance. oh and i have a uv filter what filter would make the wedding more elgent feeling???? maybe a warming filter?