Andoer Auto Focus Macro Extension Tube Ring 13mm 21mm 31mm Extension Tube Set for Canon EF EF-S 35mm Lens DSLR Camera

This is used by attaching between camera body and lens of the 35mm single-lens reflex camera. Compatible for Canon all EF and EF-S lenses. It comes as a set of 3 tubes with different lengths (13mm, 21mm, 31mm) which singly or in combination makes it usable in 7 different lengths. It couples perfectly with the camera's automatic diaphragm. With camera of TTL, AE (Through-the-Lens, Automatic Exposure) type, it gives perfect coupling except when combined with electronic flash AE unit. Upgraded circuitry to work better with digital SLRs cameras and SLR lenses.