extension tubes and Sigma lenses

I have a Sigma 30mm 1.4 that's really great.

 

do Sigma lenses use EF-S or EF mounts? I want to get an extension tube to do

macro work, but I don't know if the Kenko tubes will fit on my lens. If they're

EF-S they won't.

 

Please advise, TIA,

 

Nick

The Sigma lenses uses a standard EF mount, I guess in order to be compatible with the D30 and 10D. My EF extension tubes fit the Sigma 30mm nicely.

Please be aware that even with the shortest tube, 12mm, your working distance is going to be very tight!

FWIW, I've got <a href="http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2FKenko-Auto-Extension-Tube-Set%2Fdp%2FB000A1N8F8%3Fie%3DUTF8%26s%3Delectronics%26qid%3D1180466130%26sr%3D8-1&tag=cyclingshots-20&linkCode=ur2&camp=1789&creative=9325">this Kenko set</a> and they work fine with my Sigma 70-200 f/2.8 EX DG and other non-EF-S lenses.

<p>

Cheers!