Table S1.

Cephalopod retinal image quality budget

TermFWHM (μm)h Dependenceλ Dependence
Photoreceptor size5NoneNone
Retinal surface displacement1hNone
Cross-talk between photoreceptorsNeglected (in the text)hUnknown
Residual spherical aberration10 at full aperture∝Δh for annular pupilNone
Diffraction with d = 1 mm; on-axis pupil6h−1∝λ
Diffraction with d = 8 mm; on-axis pupil0.75h−1∝λ
Other achromatic aberrations20 at full apertureUnknown, likely ∝hNone
Chromatic aberration with d = 1 mm; on-axis pupil6hNone
Chromatic aberration with d = 8 mm; on-axis pupil48hNone
Chromatic aberration with semiannular pupil61hNone
  • The columns present the various aberration phenomena, the resulting Gaussian–PSF-equivalent FWHM, and the dependencies on ray height h and wavelength-λ. Chromatic aberration is the dominant contribution to image blurring down to 1-mm pupil diameters. The quadrature sum of the various contributions for the semiannular pupil is 65 μm and dominated by chromatic blurring. These values correspond to an f/1.2 lens with a 12-mm diameter.