More on Amazon.com : http://www.amazon.com/gp/product/B00B1ZVZF2?tag=thefatkidin06-20 <br /> <br />Aperture Macro Extension Tube Set Adapter TTL and Auto Focus for Canon Camera 3 Pieces 13mm <br /> <br />Built-in electric pins Perfect for macro shooting Support accurate TTL Autofocus Compatible with all EF and EF-S Canon lenses <br />Diaphragm control of the lens can set automatically All the 3 parts can be separated as one adapter tube to use Each adapter tube has 8 electronic contacts <br />Upgraded circuitry to work better with digital SLRs cameras and SLR lenses With lock pin High quality and compact Made of?brass and Aluminum not plastic <br />If the tubes are correctly attached TTL metering and Autofocus performance will function as usual When using Non-TTL camera you must adjust aperture and shutter before shooing to ensure correct exposure <br />This adapter is used by attaching between camera body and lens of the 35mm single-lens reflex camera It comes as a set of 3 tubes of different lengths which singly or in combination on makes it usable in 7 different lengths
