Got my tubes n this morning. Took them out for a test run. Boy, it never occurred to me that that 2 inches from your subject can be so hard, when most of them are knee high or lower.
BTW... I have read a lot of conjecture about Kenko tubes and their use with EFS lenses. Most people say that they do not function with them, and I can not say either way, but my Kenko tubes say EF/EFS on them, and they have both the red and white markers. I only have EF lenses, so that is all I know.
Here are the pics...