Metabones didn’t invent the focal length reducer, but in the same way we say ‘Hoover’ to refer to any vacuum cleaner, the moniker has become the defacto term for such a device in colloquial terminology. A Speedbooster is just a brand name for a focal length reducer: that’s what it’s proper name is. If you want to know how or why, read on.įirst thing’s first: Speedbooster® is actually a registered trademark of Metabones, the company arguably responsible for popularising them almost ten years ago with the advent of the Sony E mount and the accompanying E mount Super 35 video cameras. If you want the TL DR, it’s as follows: “Speedboosters make a lens wider and faster, but don’t change the depth of field”. I’ve tried to explain things as clearly as possible, which has the effect of making this article a bit of a lengthy, wordy one.
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