I am not very proud right now having to ask for help with this but here goes
Long story short my brother in law is getting married on Friday and he nor his family have the money for a professional photographer. So I am the only resource they have for pics of there wedding and when it comes to indoor photography I have no clue what I am doing.
I have a 450D with the 18-55 and 55-250 kit glass and a 100-400L. I have been shooting it for almost two years now but only outdoors and most of the pics are of waterfowl and large wildlife and the run of the mill pics of the kids playing.
The wedding is in a church gymnasium with ok light but nothing special. I am not in a position to purchase a new lens right now but I think I have enough to stop by the local camera store and buy 270ex or possibly a 430exII.
I guess the biggest question is would there be a point in getting one of these flashes with the gear I have? And what might be a good starting point with settings?
I will have Thursday night while they set up and a rehearsal dinner on Friday morning to Practice but that is about it.
Thank you to any one willing to give me any help. I wish I could give them better for their wedding but I will give it my best and hope to get a few keepers for them to have.

