Fig.9a - Comet 12P / Holmes on November 11, 2007, photographed through a 90 mm Megrez f/6.9 APO FD doublet refractor (with 621 mm focal length) with
an Oasis Reducer DGL 0.85x. Canon 20Da camera at ISO 1600 and 148 s exposure time.
Fig.9b - Comet 12P / Holmes on November 11, 2007 with the same setup as above but with a shorter exposure time and a lower ISO value to show the comet's
structure (17 s at ISO 800).
