extension tube

Hi everyone! I just became a father for the 2nd time today and I was thinking in investing on a macro lens to get those sweet details of the baby. But I've found out that I could just get a extension tube for the same purpose. Have anyone out there used one or have any info about these...

I was just gifted a pair of Canon extension tubes (EF12, EF25), and have discovered that they do not fit the EFS lenses I have that were made for 22.5x15mm sensors. There's a light baffle in the extender that's too close to the lens, or with too small an opening, depending on how you look at...