Excerpt: I had another brand of extention tube and recently purchased the Sigma 50mm 1.4 Art lens. The other brand of extention tube did not work because the sigma (as well as other lenses) is rear focus which hit some of the structure of the tube. The Canon tube works perfect and now I do not have to carry a macro lense while traveling.
Excerpt: This extension tube will allow standard lenses to be used in macro photography without degrading lens quality. The EF12 is the shortest and will give you the least extra CU focusing distance which can be a great help with longer lenses. I wanted to use it with my 16-35MM set at 16MM, but the furthest focusing distance was about 2" from the subject which is too close for my project. That has no bearing on the excellent quality and ease of use.
Excerpt: I love my Canon extension tube. I use it with my 50mm lens to get close up for food photography. I have definitely had to practice this method of photography, but the tube works great, it is easy to put on and take off. B&H shipping was fast!!! I will continue to use B&H for my photography equipment in the future!
Excerpt: I've tried the Extension Tube EF 12 II separately, and with a Extension Tube EF 25 II on all of my Canon EF, EF-S, and Sigma lenses. My T5i works well with all combinations by reducing significantly the minimum focus length.
Excerpt: This is the shortest extension tube by Canon. It allow full communications between the camera and the lens. Normally used for macrophotography. This extension tube can allow stacking of 2 Canon L teleconverters. This makes it possible great magnification but at the cost of multiple f stops (2 to 4 depending on the teleconverters used) and decreases sharpness, but in a pinch, it works.
Excerpt: A lot more expensive than the Kenko or Vello equivalents, but the mount is a lot more solid and ultimately, I've more confidence in the Canon product. No optical difference, although the Vello equivalent does give some sag in the mount with a heavier lens. Perhaps if I looked hard enough, I might see some corner fall off with the off-brand products.