Industar 50 features: Focal Length: 52 mm (52.48 mm) Relative aperture 1: 3.5 Field of view: 45 ° Frame size: 24 × 36 mm Number of lenses / groups: 4/3 The limits of the aperture scale: 1: 3,5-1: 16 Minimum distance focusing lens: this lens (for SLR cameras) - 0,65 m Resolution (center / edge): 38/22 lines / mm Light transmission coefficient: 0.8
