Equipped with Canon optics previously only L-series for my Canon full frame, I hesitated to get out of the rut and take a third goal. Result: very good, better than expected for optical relatively cheap compared to optical Canon L of the same power and stabilized. AF is excellent, effective stabilization. The stitched 600 remains adequate. The weight is not too important. Open 600 with the lens hood, the unit appears wearing a monster! The only complaint Amazon, which explains the absence of the fifth star. It was inevitable that it happens at least once: delivery does not take place as planned. She did-he seems not made at all. So I turned to the competition, more efficient and less expensive. But I have been paid for this failure of delivery by Amazon.
