Lenses Specification Product Name ARTRA LAB 50mm F1.1 LUNAELUMEN-M Focal Length 50mm Maximum Aperture F1.1 Minimum Aperture F16 Optical Design 8 Element In 6 Groups Angle of View 46 Degrees Diaphragm Blades 11 Blades Nearest focusing distance 0.7m Filter Aperture ? 52mm Maximum Calibre ? 62.9mm Height 67.88mm Weight 418 g Bayonet Leica M-Mount Rear intercept 26mm Focus Calibration may be needed due to the range finder camera mechanism