M97 -- Owl Nebula
From the author of Sizing Up The Universe
22:01 EST Mar 23, 2016.
Starlight Express Trius SX694 on 10" RC at f/9.
L = Ha+OIII, Ha = 15 min, OIII = 90 min
(guided 6-minute and 1-minute subexposures).
20:23 EST Mar 23, 2006.
Starlight Express SXV-H9 on 10" RC at f/9.
L = Ha+OIII, Ha = 15 min, OIII = 135 min
(guided 3-minute subexposures).
Shot through a layer of clouds (mag. 2 skies).