The Sigma FP stands for Fortissimo Pianissimo (“very loud, very soft” in musical dynamics). It is a name that symbolises two of the most interesting characteristics of the new camera: its small size and powerful performance (for video especially).

There is no other camera like the FP on the full frame mirrorless market, and its video capabilities place it closer to products such as the BlackMagic Pocket Cinema Camera 4K.
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https://mirrorlesscomparison.com/preview/sigma-fp-vs-sony-a7iii-bmpcc-4k/