I have been chosen to shoot some pictures at a Christmas event in church. The setup will be very dark (like a concert) and only the stage will be lit up. I'll probably mostly take pics of events happening on the stage; drama, music, etc.
My question is, which lens should I use or buy for this event? I'll be using a T1i and I only have the standard, 50mm f1.4, and the 55-250mm lens. I've used the 50mm in the past for dark lit rooms and it is awesome, but in this case I think most of the shots will be taken from mostly 10-15feet away so I'm afraid the 50mm will be hard to use for this close range.
TIA for your input 

