Molded Glass Aspherical Element: This lens's sophisticated optical structure allows for optimal subject separation, high resolution, and sharpness, as well as a pleasing out-of-focus quality. The fast f/1.4 maximum aperture can be fully utilized with preserved sharpness and clarity thanks to a molded glass aspherical element that compensates for sagittal coma flare. Special Low Dispersion Glass Elements: To account for axial chromatic aberration across the whole focusing range, three SLD (Special Low Dispersion) glass elements were included in the lens design. Large Diameter Lens: When working with larger apertures, it is easier to achieve greater peripheral brightness when the lens is designed with a large 85.4mm diameter and the widest elements are placed within the front group. Super Multi-Layer Coating: An Extraordinary Material