Sharpness at 15mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Leica DG Summilux 15mm f/1.7 ASPH lens was attached to a Panasonic Lumix DMC-GX7 compact system camera, which in turn was mounted on a sturdy tripod. The self-timer was used to avoid any vibrations from pressing the shutter release. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 15mm

Centre sharpness is respectable even wide open at f/1.7, sharpening up nicely by f/2.8, while the edges are acceptably sharp from f/2.8 to f/8.

Aperture	Centre Crop	Edge Crop
f/1.7
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16