A first-order analysis of the skylight scattered from the sea surface for understanding the mechanism of transfer of wave profile to photographic image has been given by Kasevich et al. (1971). The analysis is now extended to second order and numerically evaluated for clear blue and uniform overcast skies. The theoretical results indicate experimental conditions required to obtain a photographic transparency with optical transmittance linearly proportional to sea wave profile. Experimental parameters include sun angle, camera orientation, and maximum wave slope. Fourier analysis of the transparency by coherent optical processing methods will give the directional power density spectrum of the wave field (Stilwell, 1969).