Sigma calls out the Sigma 45mm f/2.8 DG DN Contemporary as follows:
With the SIGMA 45mm F2.8 DG DNContemporary, bokeh expressions are especially featured. Spherical aberration has been controlled to ensure not only the large bokeh in the front and rear of the subject but also the rear bokeh near the area in focus create a gradient to a soft blur.
This lens softens the periphery of blurred images suppressing the double-line bokeh etc. and enhances the three-dimensional impression of the subject with the smooth expressions in the foreground and the background. In addition, its minimum focusing distance of 24cm makes it possible to enjoy shooting snapshots and tabletop photos taking advantage of the angle of view. The design gives consideration to vignetting to achieve beautiful round bokeh and subdue swirly bokeh in the whole bokeh effects.
This series from f/2.8 to f/11 evaluates the Sigma 45mm f/2.8 DG DN near minimum object distance (MOD) of about 1:5, which is near-macro range. Some lenses are not as well corrected at close range and the callout as a “bokeh lens” by Sigma suggests that this might be the case. How well does it do?
Includes images from f/2.8 to f/11 at full resolution (APS-C crop).