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Message: <blockquote data-quote="hark" data-source="post: 760785" data-attributes="member: 13196">Just one more thought here, Jake. Please be sure to test the combo at its extremes. If you remember, I wound up getting my 300mm f/4 PF repaired by Nikon because eventually almost everything missed focus. And it works much better now.BUT...the 300mm f/4 PF coupled with the 1.7x TC means my wide open aperture is f/6.7. Even after the repair, subjects that are low contrast or are in lower light tend to be soft because the AF still struggles in those situations. So please assess the gear along with a TC where performance is truly put to the test. At some point, I want to move to an f/5.6 lens. When my combo works well, I'm happy with it. But there are times when it disappoints. For me, the low light and low contrast situations are where it struggles the most.Before my lens was repaired, one other thing that frequently didn't work well was focusing on moving subjects - especially low contrast ones. That would be something I'd want to test with the TC if it were me only because I remember how much my lens hunted...and how many birds I missed simply because the lens never locked focus. With a slower lens coupled with a TC, I'd want to thoroughly test it. For me, shooting wide open at f/6.7 is something I eventually want to move away from because my combo still struggles occasionally. Hopefully with the advances Canon has made, you won't run into issues with a slower lens than you're accustomed to using with a TC.</blockquote>

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