I have a new set of Phottix's new EF/EFS Extension tubes. These come in a bit less expensive than the Kenko tubes. Kenko runs around $130 or more on ebay and more from online shops, I am putting the price on this at $99 priority shipped and paypaled in the US. I had another set that sold, and was going to keep this last set, but with the Sigma 150 macro I have, I don't think I will use these.
SOLD
(For Canada, it would be $7 extra for first class USPS or $21 for priority USPS)
They are not quite a refined as the Kenko, the pins have just a little play in them, so they click more noticeably into place as you mount them, but they work great, and pass the info back and forth to the lens, allowing AF, etc just like the Kenkos. They accept EF and EFS lenses.
Here are shots of the tubes and a quick AF test on my 17-55 using one of the tubes.
