A friend was asking about the difference between the various .jpg compress settings.

http://www.dlsphoto.net/Tutorials/JpgComTest

As we talked more and more about panoramas, he asked to see the difference between the focus and f stop settings.

Focus settings:
http://www.dlsphoto.net/Tutorials/Le.../15mmFocusTest

f Stop settings:
http://www.dlsphoto.net/Tutorials/Le...Test/15mmFstop

Unless you have gone through f stop and focus tests, you can never be 100% sure you are using the optimum settings for your camera/lens.