I just bought a Nikon D3000 body with the kit lens that comes with it. I am taking lots of pictures to try and learn the basics. Here are a few that I have questions about. This shot: ISO was set to 100, shutter speed was 1/320 and aperture was 4.7 (according to EXIF data). This shot: ISO 100, shutter speed 1/160, aperture 3.6. In both these pictures things are not super crisp (at highest resolution). I am not sure what to adjust to get this. Faster shutter with higher iso? The aperture settings is a little confusing to me as well. I understand its what determines how much light reaches the sensor, but utilizing it correctly is still foreign to me. I never adjusted the aperture at all for these photos. Should i have? Thanks in advance for any help.