2x III Extender on Canon 70-200 2.8 IS v1?

Started Sep 27, 2012 | Discussions thread
wallybarthman
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Re: 2x III Extender on Canon 70-200 2.8 IS v1?
In reply to John Matthews, Sep 27, 2012

What aperture are you using with the converter?

My rule of thumb in using converters is to stop down 1/3 to 1/2 of a stop for a 1.4x, a full stop for a 2x. So when I shoot a 70-200 f/2.8 + 2x converter I'm shooting at f8.0.

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