Maximum Background Blur
This tulip picture represents approximately the maximum background blur you can get from the Sigma 17-50mm f/2.8 OS Lens. Using the maximum focal length, widest aperture, near minimum focus distance available on this lens and a moderately distant background produces a nice background blur.
Camera and Lens Settings
50mm f/2.8 1/320s ISO 100 3456 x 5184px