1、Automatic macro lens adapter ring equipped with three sections of different lengths, 31mm, 21mm and 13mm different connections, can combined arbitrarily to get the desired magnification. 2、The connecting ring can match with TTL metering and AE mode of the body to achieve AF function. 3、Small size and lightweight, easy to carry and store, convenient to use. 4、Automatic contacting ring and camera aperture linkage, contact ring structure is very simple, generally not easy to damage. 5、Made of high quality plastic material, sturdy, durable and long service life. Condition: 100% Brand New Item Type: Macro Lens Adapter Ring Material: Plastic Color: As Picture Shown Fitment: for Canon EOS Mount Camera Weight: Approx. 141g Size: Approx. 13mm/0.51inch, 21mm/0.83inch, 31mm/1.22inch Magnification: The focal length of the lens is 50MM and the focal distance is infinite -- scenes within 0.6mm and 0.6m cannot be photographed According to the different combination of the three ring, the different magnification can be realized. Take the prime lens F=50mm as an example, the magnification rate can be achieved (as follows): The ratio adjustment range (approximation) of the close-up ring composition Not add 1:0.20~1:0.34 1 1:0.34~1:0.48 2 1:0.48~1:0.62 1+2 1:0.62~1:0.76 3 1:0.76~1:0.90 1+3 1:0.90~1:1.04 2+3 1:1.04~1:1.18 1+2+3 1:1.18~1:1.32 1 x Macro Lens Adapter Ring(13mm，21mm，31mm) 1 x Storage Bag 1 x English Manual