Hey guys.. Im in the market for a Nikon 70-300mm f/4-5.6G AF Nikkor SLR Camera Lens Is it worth it?? In a nutshell, I like to shoot family portraits, nature, landscapes, and automotive photography?? Im gonna buy it on Amazon, and I have a D40..will it work out?? C&C welcome..here a couple ive shot lately with my "stock" 18-55 lens. THANKS!