Hello,
I have an A2E and I just bought a 100-300mm f5.6L lens with a Tamron 
1.4x SF AF tele-converter. With the tele-converter on, the AF seems 
quite confused. Sometimes it finds the correct focus and other times, 
the noisy non-USM lens just goes back and forth from minimum to 
maximum focus.
Also, the largest aperture without the converter is 5.6. When I put 
the converter on the largest aperture is still 5.6 not 8.0.
Does anyone one have advice or experience with these issues? I plan 
to go to Kenya in late December/January and I hope to get some good 
photos.
Charles
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