Jeremy Stein , Sep 18, 2006; 08:36 p.m.
1. Have you been putting the camera into macro mode for these shots?
2. Have you been making the shots at the widest setting of the lens?
3. Have you been using a tripod or some other means of stopping camera motion relative to the subject?
4. Have you been using a mode that lets you set the aperture to the smallest available (f8, I think)?
If you have been doing all these things, let us see a picture or two. It may be that you have not realized how shallow the depth of field will be for these pictures.