This is a Panasonic lens that is equipped with an Olympus/Panasonic Micro 4:3 mount. The lens has a maximum ƒ/1.7 aperture and a minimum ƒ/16.
From Photospecialist
Panasonic MFT 9mm F/1.7 Leica DG Summilux ASPH (H-X09)
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