Brand Name : zhongyi Number of Diaphragm Blades : 9 Blades Origin : CN(Origin) Focus Type : Standard Prime Scene Type : Insect Scene Type : Still Life Type : Fixed Focus Lens Certification : NONE Full Frame : Yes Focus Mode : MF Lens Type : Manual Use : Camera Material : aluminium alloy Weight : Approx. 1432g Use format : APS-C format Applicable models : For Fuji GFX100, GFX50, GFX50R, GFX mount cameras 35mm equivalent focal length : 51mm Aperture : f1.4-f16 Lens structure : 11 elements in 7 groups Low / ultra low dispersion lenses : 4 high refractive index low dispersion glass lenses Closest Focusing Distance : about 70cm Filter diameter : Approx. 72mm/2.8in.