Sigma 135mm f/1.8 DG HSM Art Aperture Series with Focus Stack: Quadrangle at Dusk
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See Sigma DG HSM Art lens reviews in diglloyd Advanced DSLR.
This series puts the Sigma 135mm f/1.8 DG HSM Art to the test at dusk on a 3D target with a great deal of fine detail, including stonework and fine-tipped leaves. The lens also had to cope with strong backlighting and maintain good contrast to allow a +100 shadow boost and pulling down of highlights.
A 2-frame focus stack at f/8 is also included in the f/1.8 - f/11 series.
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 with Focus Stack: Quad at Dusk
Includes images up to full resolution, with crops and Adobe Camera Raw processing settings.