💟【4 Sets of Achromatic Doublets】Dispersion is a common optical phenomenon, especially in fast lenses. 4 sets of Achromatic Doublets are used in 90mm f1.25 lens to significantly improves the chromatic aberration and the resolution performance, presenting excellent image quality.The spherical aberration of achromatic doublets is better than singlets. 💟【First Choice for Portrait&Close-up Beauty】The angle of view is 27 degrees.It highlights the main body while avoiding the suffocating sense of space compression caused by super telephoto lens. 💟【Smooth Bokeh with Fast F/1.25 Maximum Aperture】Extremely fast f/1.25 maximum aperture affords notable control over depth of field for selective focus shooting,and also benefits handheld shooting in difficult lighting conditions. The smooth transition between the focus object and the bokeh creates a dreamy picture with an ideal depth of field and fascinating background blur. 💟【A Clicked Aperture Ring】The aperture ring is stepped with the right amount of resistance and click,making on full stops from f/1.25 to f/16. 💟【Adequate for meidum format camera】There is a little bit of vignetting when mounted on medium format cameras 💟【4 Sets of Achromatic Doublets】Dispersion is a common optical phenomenon, especially in fast lenses. 4 sets of Achromatic Doublets are used in 90mm f1.25 lens to significantly improves the chromatic aberration and the resolution performance, presenting excellent image quality.The spherical aberration of achromatic doublets is better than singlets.💟【First Choice for Portrait&Close-up Beauty】The angle of view is 27 degrees.It highlights the main body while avoiding the suffocating sense of space compression caused by super telephoto lens.💟【Smooth Bokeh with Fast F/1.25 Maximum Aperture】Extremely fast f/1.25 maximum aperture affords notable control over depth of field for selective focus shooting,and also benefits handheld shooting in difficult lighting conditions. The smooth transition between the focus object and the bokeh creates a dreamy picture with an ideal depth of field and fascinating background blur.💟【A Clicked Aperture Ring】The aperture ring is stepped with the right amount of resistance and click,making on full stops from f/1.25 to f/16.💟【Adequate for meidum format camera】There is a little bit of vignetting when mounted on medium format cameras.