The last piece you need to get full coverage for the APS-C sensor size, perfect fit for 7D or C300, C100
Equivalent of a 80-240mm on APS-C
Inner Focusing and Inner Zooming System and so can be used with a mate box
This amazing piece of glass go all the way 2.8 with stabilization!
With the Tokina 11-16 2.8 the canon 17-55 and this lens, you are covering the equivalent of 18mm till 240 mm! 2.8 all the way