<b>Description</b></br>This is used by attaching between canera body and lens of the 35mm single-lens reflex camera,</br>it comes as a set of 3 tubes of different lengths which singly or in combination </br>makes it useable in 7 different lengths,it couples perfectly with the camera's </br>automatic diaphragm,with cameras of TTL,AE (Through-the lens,Automatic,Exposure)type</br> it gives perfect coupling expect when combined with electronic flash AE unit.</br>the imagic magnification ratio becomes smaller as the focal length </br>of master lens becomes longer and the larger as the focal length becomes shorter .</br>also,the distance to the subject becomes further away as the focal length of master lens becomes </br>longer and closer when it becomes shorter.In close-up shooting,</br>as the subject's depth of field becomes shallow,never forget to stop down the lens.</br>take care that when image magnification ratio increases camera s</br>hake is also liable to increase.(the use of tripod and cable release is advisable.)</br></br></br> Its dim ensines are:</br> Tube diameter:ab.62mm</br> Tube lengths:12mm+20mm+36mm</br></br></br> <b>Package</b></br> 1*12mm+20mm+36mm 1*Manual