Sorry, this may be a really stupid question, but I'm literally figuring all this out on my own with very little money and no other help. I have a Nikon D50 and have enjoyed using it. For several reasons (including for more stability in my pics and for a class I've finally signed up for), I need a tripod. I'm looking for something on the low end of the scale. My question is this: are all tripods for all cameras? If not, how do I know if one will work for my D50? And how do I find a cheap one? I did find this one online (http://www.daydeal.com/home.php?cat=1959) that looked ok and indicated a Nikon, but wanted to make sure I wasn't doing something stupid. Thanks.