Great product that Canon converter fitted to a 1.4 MM 300 f / 4 making it a 420 f / 5.6. From my side I tried it during the holidays impressed by the performance and see no great loss stung, quite the opposite is the power to go to distant subjects, very good compromise to begin in the slightest animal or proxi cost. The price is relatively high for a simple ring, but we will tell you it's the Canon L series and here we all feel it on, easy to adapt, on the 300 MM and then on the case, and there more than to have fun. No hesitation at all events at the well-known quality and performance of this product Pro. Canon. I can live without it, the results are at the rendezvous. Regarding the Premium delivery and packaging, nothing to say, nickel, thank you to Amazon again, and for the price which remains one of the lowest in the market compared to competitors that display differences quite significant and prohibitive.
