Issue: Sharp close-up focus I'm shooting close up product (shoes with rhinestones) and no matter what I try, I can't get the focus completely sharp. This is particularly noticeable in the rhinestones, which are small and multi-faceted. I'm using a Canon 40D and a Canon EF 24-105 f/4L IS lens, a light-box, two lamps, and a speedlite. AF is turned off. Mirror lock is on. I'm using a tripod and have tried 2-10 seconds timer to minimize vibration. I'm running out of ideas. The depth of field is shallow, but there doesn't seem to be ANY spot that's in focus. Is the 24-105 lens able to shoot sharp close-up details? I can get reasonably sharp results when I'm in macro, but that's too close for the product. The lens' minimum non-macro distance is 18 inches. Even at 24 inches, I still get soft details. Help? Shutter: 0.3s Aperture: f22 Thanks in advance for your help!