Hi Guys ... I just joined the forum and this looks like a place I'm gonna be spending a lot of my time on! I had a question about getting a fast lens for my DSLR. I have a Nikon D40 & the following Lens': Nikkor 18-55mm Nikkor 55-200mm. I wanted to get another lens but this one for indoor shots with low light conditions. I know having the D40 I am limited to a small range of lens. I wanted to get your recommendations!