This Macro Extension Tube Set for Canon includes 3 extension tubes - 13mm、 21mm、 31mm adapters. You may mount the tubes between lens and camera body to get your choice of macro ranges. The farther away the lens is、 the closer the focus、 the greater the magnification. This extension tube set does not affect image quality as there is no optics inside.Features:13mm、 21mm、 31mm、 can be used individually or in any combination to obtain the desired magnificationSuitable for all the models of CanonMetal digital contact point、 auto focus function、 transfer the signal stablyMove the lens from the film or digital sensor、 the closer the focus is、 the greater the magnificationThis extension tube does not affect image quality as there is no optics insideSharpness and saturation can be still maintained Applicable camera brand: Canon Package weight: 0.203 kg Product size (L x W x H): 8 x 6.4 x 5.7 cm / 3.14 x 2.52 x 2.24 inches Package size (L x W x H): 9.6 x 7.1 x 7.2 cm / 3.77 x 2.79 x 2.83 inches Package contents: 1 x 13mm 21mm 31mm AF Macro Extension Tube Set for Canon1 x Cloth Bag