It's a walking tour. So changing lenses isn't ideal since we're with the general public. Time consuming and don't want someone carelessly knocking a lens out of my hand.
The 11mm are f/2.8 but difficult to focus. I'm tempted to try anyway as it could be some cool shots.
I'm leaning towards 17-50 f/2.8 &18-55 f/2.8 but we try to use different lens to get different shots. Not sure her 10-20mm kit lens will let in enough light or if the flash will work well in that situation (she hasn't used it before - a recent gift).
Worst case, we'll have to go on the tour again.