Have the part now in a week in use. I can think of so far no negative traits. I have a total of 10 Canon, Sigma and Tamron lenses, all so perfectly functioning. However, strike the auto focus, if I try my 15 year old teleconverter interpose, but makes überhautp anything because I always manually focusing with these focal lengths. In my opinion, absolutely first class. The article, which I got, has no excessive tolerance, all lenses, partly still in 1998, sitting very well.
