TTartisan is a camera lens brand known for affordable, unique and metal bodied manual focus lenses with vintage-inspired designs 23mm APS-C is equivalent to 35mm which is known as the "Eye of Humanities". You can use this lens virtually in every situation. TTArtisan APS-C 23mm f1.4 lens adopts an optical structure of 8 elements in 6 groups,including one low dispersion elements and three high refractive elements ensure the image quality. 62 degree angle of view It provides wonderful and soft bokeh with the maximum aperture f1.4, support images with low ISO in dark light environment to ensure high image quality.