Question about Canon Extender EF 1.4x II Lens
I have an EOS 40D with a 100-400 is usm lens. I just traded in my original EX 1.4x for a new EX 1.4x ii on the understanding that it would autofocus this lens. But it doesn't. Any ideas??
The EOS 40D only use auto focus up to aperture 5.6. Only the 1-series use auto focus up to aperture 8.
The adapter adds 1 stop to the lens aperture. Since the 100-400 is a 4.5-5.6, the aperture range with the extender mounted will be 6.3-8.
There is a work around though. Just place a thin strip of insulating tape over the three pins on the lefthand side (lens side of the extender). No damage will occur to the camera or teleconverter.
Posted on Jan 19, 2009
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Posted on Jan 02, 2017
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