My favorite time to observe Mare Crisium is a few days past full moon, a few hours past local midnight. The 17-day old waning moon was high in the sky and the night offered perfect seeing conditions. The inner wrinkle ridge ring and the mare boundary, the Crisium ring define the main features and are more visible at sunset (on Crisium). Through the exceptional optics of the Astro-Physics refractor, Mare Crisium's contrasty greys are visual poetry. Telescope F/9 AP180EDT refractor, 25mm Zeiss Abbe Orthos and Zeiss Binoviewer. 180x (RUKL 26).