Fringer EF-FX vs Metabones Speedbooster EF-FX (with Sigma 150-600)

Started 2 months ago | Discussions thread
wy2lam Veteran Member • Posts: 3,330
Re: Fringer EF-FX vs Metabones Speedbooster EF-FX (with Sigma 150-600)

I see, interesting.  I've never thought that a Speed booster can help with AF.  Perhaps teleconverters slows down AF so a focal reducer might do the opposite.  Are you finding the AF lacking with an ordinary adapter?

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