Optical Aberrations
Diffraction MTF cutoff, natural (cos⁴) vignetting falloff, and barrel/pincushion distortion visualization.
Lens & Sensor
Distortion
Negative = barrel, positive = pincushion
Diffraction MTF Limit
Natural Vignetting (cos⁴ law)
Distortion — Grid Visualization
Corner Illumination Across Sensor Formats