Roman I did not know you shot the 100-300. I have one that I've only used to test. I did not like it wide open so I put in my safe and never have gotten it out again. It's brand new, but not up to what I consider quality for shooting sports action and wildlife at F/4.

I even had it sent it (when it was brand new) because I did not like the image quality and I noticed a color shift as compared to my nikon glass. It's got a great build, but I found the image quality to be lacking. Sigma also told me NOT to use a filter on it - wow, that's not going to work for me. so, there it sits.