viltrox VILTROX 13mm f/1.4 F1.4 Fuji x Mount Ultra Wide Angle APS-C AF Lens Fujifilm USA Written by admin on April 24th, 2024. VILTROX 13mm f/1.4 F1.4 Fuji x Mount Ultra Wide Angle APS-C AF Lens Fujifilm USA. 13mm (35mm Equivalent Focal Length: 20mm). 14 Elements in 11 Groups. Dimensions (ΓΈ x L). 74 x 90 mm.