Testing my new Sigma 24-60mm f/2.8 lens for sharpness, bokeh and other performance issues. All 4 photos in this gallery are unprocessed, straight from the camera. This shot was taken wide open at 2.8 aperture with a shutter speed of 60. The light was provided by one SB600 firing through one translucent white umbrella placed slightly to my right. The focus looks very sharp, which is really remarkable considering the 2.8 f/stop. I like the soft, blurry bokeh, which really isolates the subject. This lens has a 9-bladed diaphragm, which should provide very smooth bokeh.