Comparison of solar scenes in Hα and Lyα. Scales in arcsec. The images have identical field size but sample the Sun at different times (July 8, 2005 and June 14, 2002) and viewing angles (μ = 0.98 and μ = 0.68 with the limb to the top). The first is an Hα line-center mosaic constructed by P. Sütterlin from nine images he took with the Dutch Open Telescope (DOT, Rutten et al. 2004). The second is part of the 13th wide-band Lyα image from VAULT-II (Vourlidas et al. 2010). The DOT pixels were 0.071 arcsec, the VAULT pixels 0.124 arcsec. The claimed resolution is 0.3 arcsec for both, but zoom-in per pdf viewer suggests that the DOT image comes closer to this value than the VAULT image.