I am relatively new to photography. I have had a Nikon D50 for about 2 years and love using it. So far I have only been using the kit 15-55mm lens. I am thinking about purchasing some new lenses but have no idea what to get. I do a wide variety of photographs from close-up isolated objects to wide angle low light shooting and lots in between. Can anyone suggest some good all purpose lenses for my Nikon D50? Also, please list what each lens you recommend is ideal for. Thanks for the help.