On our way back today from playing in the river in The Great Smoky Mountains National Park the sky suddenly caught my eye. It was so interesting everybody in the car was saying "Hurry hurry you are going to miss it" as I pulled over to a safe place. Using a 300 mm lens I took a few shots then the sun disappeared behind the huge thunderheads never to be seen again this evening. What really helps in high pressure times like this is a total familiarity with your equipment so you can react more intuitively and not get slowed down by the technical end.LynnFreeny.com