Sharpness at 100mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Panasonic LEICA DG VARIO-ELMAR 100-400mm f/4.0-6.3 ASPH Power O.I.S. lens was attached to a Panasonic Lumix DMC-GX8 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 100mm

Both centre and edge sharpness are excellent from f/4-f/11. Diffraction starts to affect the image sharpness from f/16 onwards.

Aperture	Centre Crop	Edge Crop
f/4
f/5.6
f/8
f/11
f/16
f/22