Sharpness at 50mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Samyang XP 50mm F1.2 lens was attached to a Canon 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 50mm

Both center and edge sharpness are excellent between f/2 and f/11, but there's obvious softness evident wide open at F1.2 to f/1.8 in both the centre and edges of the frame. At f/16 the overall sharpness is beginning to drop off due to diffraction.

Aperture	Centre Crop	Edge Crop
F1.2
f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16