The 7Artisans M50mm F1.1 lens features an optical system consisting of 7 elements in 6 groups, based on the Sonnar formula. It includes two high-refractive optical elements with an index of 1.9 to enhance image quality and the lens's portability. During development, the effects of field curvature and image astigmatism on the out-of-focus areas of the image were analyzed. Numerous corrections and improvements were made, resulting in higher image quality. When you open the lens to an aperture of F/1.1, you achieve a soft and pleasing bokeh. Stopped down to F1.4, sharpness is improved while the out-of-focus areas remain soft. Repeated corrections of spherical and chromatic aberration lead to a precisely controlled bokeh shape and good contrast and sharpness in the focus area of this large-aperture lens.