FStoppers Are Sigma and Panasonic Coming for Canon, Nikon, and Sony?

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Every so often, a product launch doesn’t just release something new. Rather, it changes the tone of an entire ecosystem. This is what Sigma has just done with two lenses that, on their own, would be remarkable, but together feel like a tectonic movement. And they show that the big three (Canon, Nikon, and Sony), might be on notice.

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