And if you're not using a digital camera, plan on spending LOTS of money on film and processing. I probably get 1 in 50 good shots. With digital you can play with settings at will, especially aperature and ISO, until you find the right balance between good light and sharp focus. Also, ditto the Photoshop. Manual levels adjustment using the black and white point color pickers is a Godsend. (I used to work on the Photoshop team at Adobe, so I'm biased...) Oh, I also really like black backgrounds for tank photography.