Sharpness at 600mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Tamron SP 150-600mm F/5-6.3 Di VC USD lens was attached to a Canon 5D Mark III body, which in turn was mounted on a sturdy tripod. Self-timer mode was activated. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 600mm

The center and edges aren't critically sharp until you stop-down to f/11, which means that you should only use the 600mm focal length sparingly if sharpness is your number one priority.

Aperture	Centre Crop	Edge Crop
f/6.3
f/8
f/11
f/16
f/22
f/32
f/40