Sharpness at 135mm

For this test, the Panasonic Lumix S 28-200 mm F4-7.1 MACRO O.I.S. lens was attached to a Panasonic Lumix S5II body, which was in turn mounted to a sturdy tripod. Exposure delay mode was activated. Tonal and colour variance across the crops are due to change in natural light during the session.

The full frame at 135mm

Centre sharpness is soft wide-open at f/6.2, but excellent from f/8 through to f/11, with f/16 and especially f/22 being adversely affected by diffraction.

The edges aren't quite as sharp as the centre, with f/8 to f/11 producing the sharpest results.

Aperture	Centre Crop	Edge Crop
f/6.2
f/8
f/11
f/16
f/22
f/32
f/45