70D + 100-400 + 1.4TC?

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bill hansen
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70D + 100-400 + 1.4TC?
5 months ago

At first this seems to be a topic which was beaten to death years ago - but maybe not, with the hybrid PDAF focusing mechanism of the 70D. Having owned (and sold) a Canon 100-400 L IS some years ago, I unexpectedly find myself needing long reach for a wildlife photography trip.

The 100-400 L IS still seems to be the best option which I could afford. I'd like to use it with a 1.4X TC - but with the TC, will it still autofocus with reasonable speed? Will it autofocus at all?

Are there any good alternatives to the Canon 100-400? From reading reviews and experiences, I get the following impressions: The Tamron 150-600 is apparently excellent for stationary subjects but is very slow to autofocus (therefore not satisfactory for moving subjects), and does not work well past 500. The Sigma 150 - 500 is bigger, heavier, and perhaps not quite as good in resolution and contrast as the Canon 100-400.

Any experiences or thoughts are welcome.

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Bill Hansen
Ithaca NY, USA

Canon EOS 70D
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