Minolta 300mm 2.8 HS AF with 2x teleconverter

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Sr59
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Minolta 300mm 2.8 HS AF with 2x teleconverter
5 months ago

I would like to use Minolta 300mm with my Kenko 2x teleconverter but AF is not working. I have A57 body. This lens with 2x teleconverter has max 5.6 aperture so it should be able to AF, right?

Is the problem in A57 AF system or Kenko 2x or am I just hoping too much?

 Sr59's gear list:Sr59's gear list
Sony SLT-A57 Sigma 18-250mm F3.5-6.3 DC OS HSM Tamron SP AF 90mm F/2.8 Di Macro Sigma 70-200mm F2.8 EX DG OS HSM Samyang 8mm F3.5 Aspherical IF MC Fisheye +2 more
Sony SLT-A57
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