Andoer Macro Extension Tube Set 3-Piece 13mm 21mm 31mm Auto Focus Extension Tube Rings for Camera Body and Lens of 35mm SLR Compatible for Canon all EF and EF-S Lenses Features: 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. Superior lock pin which can tighten the tube joint. Exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its optical quality. Specifications: Brand: Andoer Color: Black with red Material: Aluminum alloy and plastic Tube Diameter: ab. 62mm Tube Lengths: 13mm, 21mm, 31mm Item Weight: 105g / 3.7oz Package Size: 10 * 7.5 * 7.5cm / 3.9 * 3 * 3in Package Weight: 140g / 5oz Package List: 1 * Macro Extension Tube Set 1 * Storage Bag 1 * User Manual (English) Note: Camera and camera lens are not included.