A simple way to TEST of your camera's Auto-Focus system ... For when you suspect your camera is not working correctly or NOT focusing this test will confirm any suspicions. This TEST could also be used to give a general idea of how well your camera is performing and is focusing even though the CAM might be working correctly. Might also be useful for comparing two different camera systems but now I'm working on imagination as to possible uses ... For the 'background' and the actual 'How-to' go to the source of the information, we need the source to download said 'Test Chart (PDF)' anyway. FYI: [acronym=EYE See! "w00d's Photo Musings" LINK to my BLOG][shadow=grey,left][size=1em]w[/size][size=1.25em]00[/size][size=1em]d[/size][/shadow][/acronym] In addition: Does your camera have a focus problem? [hr] Here is teh result when I tested my AF Nikkor (Nikon) 16-85mm 1:3.5-5.6 ED Zoom. However the images we're re-sized smaller by Photobucket resulting in the 'strange' horizontal lines throughout theses two images? for a closer look [hr]