This photo was taken without a flash, and it was almost completely dark out. Shot on a Canon 5D Mark IV at ISO 6400, 24-70mm lens at 24mm, 1/80 sec. F2.8 . The reason for the backlight ... the official wedding photographer's on camera flash had literally snapped in half earlier during the wedding reception, thus rendering her unable to do her job. I gave her my on camera flash to use to complete shooting the event. Right as I fired the shutter for this frame, her flash went off from left of the groom just behind the car. My favorite image from the event of my daughter, the bride!