Sigma APO Teleconverter 1.4x EX DG for ...- User Rating: 
Summary for Sigma APO Teleconverter 1.4x EX DG for ...- Grey Market item...
Notes on Sigma APO Teleconverter 1.4x EX DG for ...- The item arrived in the original box with all original paperwork, but with a Sigma worldwide warranty, not a USA warranty. If there were something wrong with it, I would have to send it to somewhere other than Sigma USA for repair or replacement which could be problematical. This has no bearing on the teleconverter, as it is a genuine product and works very well on my 70-200 f/2.8 EX DG lens. It has little or no effect on sharpness or color.
It's possible that Amazon is unaware that their third-party fulfillment partner is shipping the lower-priced Grey item instead of the USA version since it is priced is the same as the USA version at B&H. It may also be that Sigma only has a Worldwide warranty unlike Sony, Canon, Nikon, etc.
Either way, be aware.
Sigma APO Teleconverter 1.4x EX DG for ...- User Rating: 
Summary for Sigma APO Teleconverter 1.4x EX DG for ...- incompatible
Notes on Sigma APO Teleconverter 1.4x EX DG for ...- this is only compatible with select Sigma APO Lenses. Most other lenses won't even fit on it.
Sigma APO Teleconverter 1.4x EX DG for ...- User Rating: Summary for Sigma APO Teleconverter 1.4x EX DG for ...- Works just as described
Notes on Sigma APO Teleconverter 1.4x EX DG for ...- Great addition to the 50-500mm sigma. Manual focus only, but really gets close to your subject from a distance. Very well built, solid.
