Illustration of the performance of the AO system and the resulting image quality at wavelengths below 400 nm. The top three panels show the resulting CHROMIS WB images after summing the 100 observed images during 2 s and only compensating for relative image motion (tip and tilt) between the individual exposures. The bottom three panels show the same observed images, but after applying MFBD image reconstruction to compensate for the 100 most significant KL modes. The wavelengths are (left to right) 395.1 nm (FWHM 1.0 nm), 396.85 nm (Ca II H core, FWHM 0.35 nm), and 399.96 nm (FWHM 0.35 nm). The FOV is 20″×30″. The Fried parameter r₀ for these data, as measured at 500 nm by the AO system, was (left to right) 30.9 cm, 20.1 cm, and 17.9 cm. At 400 nm, this corresponds to r₀ values of 23.6 cm, 15.4 cm, and 13.7 cm, respectively. The tiny bright points are indicative of the spatial resolution.