<https://blog.sigmaphoto.com/2022/work-and-play-with-sigma-x-mount-prime-lenses-for-fujifilm-cameras/dflux-x-mount-bts4/>
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"DFlux-X-Mount-BTS4 | SIGMA Blog"
<https://blog.sigmaphoto.com/2022/work-and-play-with-sigma-x-mount-prime-lenses-for-fujifilm-cameras/dflux-x-mount-bts4/>