With the 3 spacers in the Caruba Extension Tube set Canon Chrome (type II) you can make a subject bigger and you can focus up close. This makes them suitable for close ups and macro photography. This set consists of 1 intermediate ring, 12mm, 20mm and 36mm, all of which can be used on an EF or EF-S mount. The intermediate rings can also be attached to each other. Autofocus, light metering and image stabilization in the lens you confirm will continue to work.