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. Specially made for APS-C frame models, also a good lens for storytelling. 23mm focus length is equivalent to 35mm of full frame, which is known as the "eye of humanity". 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. "Eye of humanity" 35mm focus length which is known as the "Eye of Humanities". 23mm APS-C is equivalent to 35mm, you can use this lens virtually in every situation. Multi-role lens It can also shoot the landscape and humanities with equivalent to 35mm,get a double advantage and makes your focusing life much easier. Large aperture of F1.4 Bokeh often increase an aesthetic, romantic and warm atmosphere to photos,fast f/1.4 maximum aperture provides better condition for createing a wonderful bokeh. Retro and elegant appearanceThe retro look shows acme of elegance when you shooting. Brings you full of gratification even just looking at it. Design of Clicked ApertureSkillful manufacture,brings you a master photography experience.