At DxOMark, we put the lens through our rigorous testing. However, we excluded the lens’ two softfocus settings when we analyzed it in our labs. These softfocus settings would have impacted its performance in specific categories like sharpness.
Strengths of the Canon’s EF 135mm f/2.8 Softfocus lens:
• Sharpness was good, especially at f/5.6.
• Chromatic aberration, which was measured at 6µm, was well controlled.
• Distortion was minimal.
Questionable aspects of the Canon’s EF 135mm f/2.8 Softfocus lens:
• The lens received a transmission score of 3.2 T-stop, meaning the widest aperture is closer to f/3.1, not the advertised f/2.8.
• The lens had notable vignetting at the low aperture f/2.8.