Sigma 135mm f/1.8 DG HSM Art Aperture Series: Grass Stems in Blue Boulder (Nikon D810)
Get Sigma 135mm f/1.8 DG HSM Art at B&H Photo.
This series looks at rendering style for the first few apertures.
In my review of the Sigma 135mm f/1.8 DG HSM Art in Advanced DSLR:
Sigma 135mm f/1.8 DG HSM Art Aperture Series: Grass Stems in Blue Boulder (Nikon D810)
Includes images up to full resolution from f/1.8 through f/4.5 plus f/13.