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

Started 3 months ago | Discussions thread
OP xaprb Forum Member • Posts: 78
Re: Fringer EF-FX vs Metabones Speedbooster EF-FX (with Sigma 150-600)

Thanks for your message. I own some SpeedBoosters, but only "dumb" mechanical ones. They work great, optically; I started this thread to ask if anyone knows if they work great in enabling lens features like image stabilization and autofocus, too. My theory was that my Sigma doesn't focus well because it's not getting enough light, but after further testing I think I've got a lemon. I didn't do a great job in this thread of documenting my progression of lens testing and findings.

Regardless, I would be very curious to hear what you find. Is the Metabones just as smart as the Fringer, but also with focal-reducing optics? Or do its electronic functions fall short of the Fringer?

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