I just bought a D50 and am thinking about which lenses to buy next. But I'm confused. It seems that there are many choices: Nikon AF-series, D, ED, G, and many more types that promise to work on the Nikon D series cameras. Does anyone know where I can find a site or a description of the differences? Why so many choices? Difference in quality, or just age? Is this a repeat of the days when Nikon first came out with the E Series lenses and everyone complained about the production quality? I searched photo.net first, but it's kind of a vague search term and I didn't have much luck. Thanks. Jeff P.S. Life was so much easier when all I had to do was pick from AI or AI-S lenses for my old FMs.