The Canon EF 12mm Extension Tube II is slightly smaller than half the size of the Canon EF 25mm Extension Tube II. The 25mm review is applicable to the Canon EF 12mm Extension Tube II as well.
The Canon EF 12mm Extension Tube II is pictured above with the included Canon Pouch.
Bringing you this site is my full time job (typically 60-80 hours per week). Thus, I depend solely on the commissions received from you using the links on this site to make any purchase. I am grateful for your support! - Bryan