Features:The 3 extension tubes can be added between the camera and the lensBy moving the lens further away from the film or sensor in the camera, the lens is forced to focus much closer than normalThe greater the length of the extension tube, the closer the lens can focusIt is durable and reliable for long-term useThis extension tube ring does not affect image quality, because there is no optics insideLength adjustment will not affect sharpness and saturationThis brand new Macro Extension Tube set for Canon EOS EF film and digital SLR cameras is composed of 3 extension tubes - 7mm, 14mm, 28mm and male and female adapters. Mount the tubes between lens and camera body to get your choice of macro ranges. 8 combination in total!Use this set with your normal lens and you will get the quality, which is as good as the original lens and the size, sharpness and versatility is perfect for the macro and close-up pictures.This Macro Extension Tube set does not preserve the automatic diaphragm. You need to use manual focus and manual exposure while shooting.Specifications:Dimensions: 2.80 x 2.60 inch / 7.1 x 6.6 cm (H x Diameter)Weight: 4.44 oz / 126 gMaterial: metal (not plastic)Color: blackSize: 7mm tube (Tube 1); 14mm tube (Tube 2); 28mm tube (Tube 3)Compatible with: All CANON EOS EF DSLR & SLRNOTS:This extension tube consists of 5 parts:Camera Body Mount AdapterLens Mount Adapter7mm tube (Tube 1)14mm tube (Tube 2)28mm tube (Tube 3)The more tubes you add, the closer the focus and the greater the magnification.There are no electrical contacts in the extension tubes. Exposure has to be adjusted manually. Aperture control is not available if you use a lens which does not allow you to manually adjust the aperture (without an aperture ring).Package Includes:1 x Macro Extension Tube Set(3 extension tubes)How to use:Please note: when tubes attached, you need to do all manually, and it is important that you use lot of light.There are some main steps how to use tubes:1) set your lens to maximum aperture (recommend);2) set-up camera and lens to manual mode, switch off and detach the lens;3) attach extension tube between the camera and lens (look for red dots and align on mount collars; attach same way as lens);4) put your camera on tripod, or better on rail system;5) put object close to the lens and use lot of light (2-3 flashguns, or 3x 500w lamps, or at least 1 strobe-light, or take pictures outside in bright sun);6) increase ISO, decrease shutter speed;7) focus by moving camera further or closer (if on rail system), or use manual focus ring on lens mm by mm (very slow) until object in focus. Please remember that DOF (depth of field) is very small.You don't need to use all tubes together - you can combine tubes - shorter length you use, in viewfinder becomes lighter, but again not as high magnification as with all tubes together.