Hmmm... Got to get my 70-300 out & try that as soon as a see the hummers out. Yours looks a lot sharper. Was it handheld or on a tripod? I don't have a feeder anymore & have to catch them in the wild (many different locations.
My late wife was known as the Hummingbird Lady. One of the local TV stations came out to do a story on a nest that was clearly visible on a low branch. They also did a spot on my in-laws two feeders that would gather 20+ hummers at a time. (It's my understanding that this is very unusual.) They varied slow motion with real-time using Rimsky-Korsakov's Flight of the Bumblebee in the background.