Really all types of cameras are fine for taking tank photos. The difference is it's easier to get the photo into the computer with a digital camera AND it gives you instant ability to look at the photo, decide if you wish to keep it, and the ability to take another one if the first one didnt turn out. Also with a digital camera you tend to have a slightly different response to light and dark areas then you would normally see on film. Generally a tank is rather dark and your digital camera tends to pickup the dark areas a little easier then with a film camera where you would need higher speed film or a flash. I tend to find though if you practice at your film photography you can get much more amazing, clear, and vibrant photos with film but it takes more effort.