August 2004 Image of
Trifid Nebula M 20
C-18 with ST-2000 CCD
and Astronomik type2 filter set
This is an LHaGB exposure
using a 13nm Ha bandpass filter for the red information.
Exposure times were 5
minutes each color
This inset shows the
combination of resolution and light gathering power
necessary to reveal 7
stars in the centered grouping.
C-18 images courtesy
of Norma Rose Observatory, Queensland, Australia.