on 21 February 2011
Product arrived within 5 days (international delivery from UK to Italy). The packaging protected the product very well. Upon use I found that this lens is excellent for prime (fixed focal length) lenses. To avoid image distortions it is advisable to close the diaphram (on a 50mm f1.8 I had to stop down to f4). Beware, the real magnification is around 1.4x and not 2.0x as the product describes. Using this lens on a zoom (especially tele zoom) is a bad idea as auto-focus is impossible at long focal lengths.
on 2 August 2011
At first sight, it seems will be good, but you install it in an Objetiv, and yes 1.5x or more, but the resolution and sharpness is minimal. Obviously, with autofocus it doesn't work.