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Hello all, I am another newb who has discovered the fountain of knowledge here. Wow, I feel like I learn something everytime I am here. Something that I keep seeing, and I must confess, I am completely ignorant about, is people have repeatedly mentioned using "fast lenses", Last year I moved from a P&S to a Nikon D5000, I have 2 kit lenses- 18-55 and 55-200, and I also bought a Sigma 70-300 lens. I dont know which one if any of them are fast or not- I am really trying not to shoot anything in auto mode and I am trying to shoot everything in Aperture or Shutter mode, although when I read something here that fits my situation, I am also shooting some in Manual mode. I have been shooting in RAW and am amazed at the quality, depth, richness, and flexibility that I now have with my images, and I am getting some real good shots of my kids.

Back to my question- How do I know if I have a fast lens, and the next time I am shopping for a lens, how would I know a fast one from a slow one.

thanks

And Wulf- I was in Oxford in early 2008, (Nielsen company meeting)- what a beautiful place. I enjoyed myself immensely in your city, and had a pint or two, at most of the pubs, (Eagle & Claw, the Bear, Goats Head,etc) you live in a wonderful city.