Canon FA-DC 58 B FilteradapterMit my previous (no-name) filter adapter I was not satisfied. The original Canon adapter is much better. In particular, that during zooming the adapter lengthwise flexibility is (the front part moves when zooming out with) I like it very goes. This shadowing of the corners does not take place at the Canon adapter. The adapter is very high quality and I would highly recommend it to others interested. Oyzepi