Hello, just found this forum and will probably be spending a great deal of time here. I'm a very amatuer photographer with no formal training or anything. I have a Pentax *ist DL DSLR and I love it. I got it with the Pentax 15-88 Zoom lense and was thinking of getting some other lenses for it when money permits. I do a lot of landscape and nature shots, so I'm really not sure what types of lenses would be suitable for that. Also I was wondering if all Pentax lenses would work with my camera, and if only Pentax lenses would work with it? Money is pretty tight, so some good recommendations that won't break my wallet would be appreciated. Thanks in advance for any advice.