See my Pentax K wishlist at B&H Photo.
This close range aperture series shows the full performance range of the Pentax HD FA 50mm f/1.4 SDM AW from f/1.4 through f/16 using pixel shift. In spite of the exceptionally flat lighting, textural rendition is stunningly good.
This series is also an outstanding demonstration of the dulling effects of diffraction: dulling starts subtly at f/8 and the dulling accelerates from the.
Includes images up to full camera resolution from f/1.4 through f/16.