I think there must be sample variation on this lens. I had one that was obviously very soft after about 200mm at all apertures. Otherwise, it was OK up to about 180mm. The IS is a good feature, but a monopod gives essentially same benefit at a cheaper price. I eventually sold min.
![CAN(70-300)_090mm_[f04.5].jpg](https://a4.pbase.com/t6/57/339257/4/76423732.YiR94N5h.jpg)