The only lens I own for my Nikon D200 is a Nikon "AF-S DX VR Zoom-Nikkor ED 18-200m F3.5-5.6G(IF)," also known as "the 18-200mm."

I really love it as a fantastic all-around lens, but at f/3.5-5.6, I find that it is sometimes a bit slow (that is, it doesn't let in enough light for me to use a fast-enough shutter speed). So, I've been thinking of getting a faster (allows in more light) lens for use in lower-light situations.

Because of its "18-200mm f/3.5-5.6" name, I know that my lens is f/3.5 at 18mm, and f/5.6 at [...]