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Hello everybody! New to the forums. I am about to buy the GH4 but I have a question that was probably posed already (I just couldn<t find the answer). I own a 5D MK II and these are the lenses I have: Sigma 70-200 1.8 - Canon 17-40mm - Rokinon 85 mm - Tamron 28-75mm. I would like to know if it is possible to use them with a speedbooster (on the GH4) AND keep the autofocus option that comes with the GH4. If it is possible at all, which speedbooster? Thanks in advance for your help!