Short & Sweet with a Long Reach
As a pixel peeper I didn't expect much out of this 1.4X extender, but after my ist day of shooting birds-in-flight I was pleasantly surprised with the results. I use it primarily with the Canon 100-400mm II lens to bring it close to the long end of my Sigma 150-600mm Sports lens (560mm vs 600mm).
Now I always have the extender on that lens when I use it in the wild.
Is the 100-400mm sharper without it... Maybe, but if so, not too, too much.
I was equally surprised with the AF performance.
Is it as fast or versatile as the naked 100-400mm - NO!
Is it acceptable - Yes, and with practice it can be awesome.
With the Canon lens I mention hear I seem to get all of my focusing points, but in reality, even though it looks like they are all working, and they will grab a focus, they do not lock on perfectly... so you will get a lot of soft images using anything but the center focusing points.
As advertised, its not as fast, but it is surprisingly fast compared to what I expected... Surprisingly!
Another thing worth mentioning is that it is Super easy to manually focus my combination. Ive shot dragon flies from 10' perched on a dancing weed on a windy day and got excellent results, as well as birds-in-flight.
Yes, the experience of the photographer comes into play, but if you need that extra reach, this extender will give it to you, and with great results if you learn how to work with it.
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