The Sigma 70mm F2.8 DG Macro | Art lens is amazingly sharp, even wide open. Nine rounded aperture blades give amazing bokeh. The detail and sharpness of this lens is outstanding! This ring is captured at 1:1 magnification, 1/180 @F2.8 ISO 100 with off-camera strobe. The depth of field is razor-thin, allowing for creative focal plane detail shots.