.Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance.
Support autofocus function and gives you confirmation signal in view finder once you focus objective accurately.
They contains two tubes of different length, a 10 mm, 16 mm, which can be used individually or in any combination to obtain the desired magnification. It usable in 3 different lengths.
It couples perfectly with the camera's automatic diaphragm.