I see this most mornings out the kitchen sink window. Hummers flocking around the nectar feeders, backlit with early morning sun. I set the shutter speed to max and ran the aperture setting up and down the stops, looking at the results on the LCD screen. I wanted the bright glow in the nectar to dominate and to stop the motion so that the wings were sharp. I forgot to change the ISO setting from auto so the camera ran it to the maximum of 3200, giving the photo that grainy look.