Sharpness at 100mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Tamron 70-210mm f4 Di VC USD lens was attached to a Canon EOS 5DS R 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 100mm

Both center and edge sharpness are excellent between f/5.6 and f/11, with some slight softness evident at f/4. At f/16 and f/22 sharpness is beginning to drop off a little due to diffraction.

Aperture	Centre Crop	Edge Crop
f/4
f/5.6
f/8
f/11
f/16
f/22
f/32