I've been using it for years and have never regretted buying it. before buying, I rented this tamron and sony 24-70 f2.8. picture is the same. if you use it on a tamron stub, then everything is ok, but with the sony 24-70 f2.8, problems arise when you unscrew the zoom by 70 ronin s, it slowly starts to go down (it is solved by the ronin settings, but with a tamron there are simply no such problems - very easy)