Works well with the original Canon 18 - 55 mm

The lens works well with the Canon 18 - 55 mm. However, only in the nearly full zoom mode. In smaller areas Zoom the image instead of square only around. However, since making the teleconverter makes no sense, because you can cover with the original Zoom this area indeed.

However, the teleconverter will not work with a Tamron 70-300 mm. Here there are significant quality losses. On the objective of the tele-converter can not be used.

So if next to a 18 - 55 mm and a 70 - 300mm lens purchases, which can dispense with the teleconverter. Otherwise, only the 18 - 55 mm lens a nice addition.