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https://mctroniktek.com/photo-video/rokinon-rk12m-fx-sil-12mm-f2-0-ultra-wide-angle-lens-for-fujifilm-x-mount-cameras
Made just for mirror less cameras is the new Rokinon 12mm f2.0 NCS CS Ultra Wide Angle Lens. Its 35mm focal length equivalency for Fuji X Mount Digital Cameras Is 18mm. With an f2.0 maximum aperture, it is particularly effective in low-light capture and can control shallow depth of field for precise subject focus with pleasing out-of-focus backgrounds. It offers a minimum focus distance of 7.9" and its front filter thread accepts 67mm size filters. The lens's impressive optical construction consists of three Extra-low Dispersion elements, one aspherical, and one hybrid aspherical element. The nano-crystal coating is applied to the inner surface of the two front-most lens elements to minimize ghosting and flare and improve overall image clarity.