1.4x or 2x?

Started Sep 6, 2012 | Discussions thread
ARShutterbug
ARShutterbug Veteran Member • Posts: 8,961
Neither

The reach will come from a lens like the Canon 800 f/5.6. Adding an Extender to an f/5.6 lens will cost you the auto-focus and the viewfinder brightness. Although the latest Extenders are supposedly excellent for quality, they're only as good as your lens. A 100-400 isn't a 400 f/2.8, and at those focal lengths you're also going to run into problems of air turbulence causing a reduction in sharpness.

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AC1
AC1
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