Sharpness at 42.5mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Zhongyi Mitakon 42.5mm f/1.2 lens was attached to a Panasonic Lumix 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 42.5mm

Centre sharpness doesn't really become accptable until you stop down to f/4, unless you want to intentionally add a "dreamy" look to your photos. The best results are obtained fromfrom f/5.6-f/11, with diffraction adversely affecting f/16. Edge sharpness is similar, with the best results obtained from f/5.6-f/11.

Aperture	Centre Crop	Edge Crop
f/1.2
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16