After The Storm - Double Rainbow

A storm system passed through the subdivision I live in this evening. I glanced out the door of my patio and saw this perfect rainbow.. then noticed it was a double rainbow but fading fast.
I ran upstairs to grab my XT1 and took this shot using the 18-55. It wasn't wide enough so I decided to take three shots beginning at the left of the rainbow and then stitched them together to produce this shot.
I could kick myself because the ISO was set at 1250. I shot this at 1/1000 of a second. Velvia setting.. but it is what it is. On a day when I thought I would get no photos at all due to the weather I end up with this.
Fuji X-T1 - 18-55mm ISO 1250 f/3.6 1/1000 sec