50
51
Telescope Focal Length Angular Field of View Image Scale of the Moon Image Scale of M42
3000mm 27.8’ X 18.1
3910mm 21.3’ X 13.9’
appendix C. Summarized Procedure to Imaging Deep Sky Objects
Action Process Tree
Image Capture
1. Focus on a moderately bright star at
least 30º (or more above the horizon).
Camera Control Window, Mode � Light Color 1x1, Single � Expose (approx 1 second)
Draw a subframe around the star to focus on
Camera Control Window, Mode � Light Color 1x1, Single � Expose (fraction of a second)
Focus on the star.
Camera Control Window, Subframe � Reset
2. Acquire and center the deep sky object
you want to image. Autosave as many
images as you would like (5 or more
images is recommended to later
combine).
Take some single exposures to ensure the object focus, centering, and orientation are correct.
Camera Control Window, Mode � Light Color 1x1, Single � Expose (X # of seconds)
Begin capturing and saving the deep sky images. For best results, choose Light Raw 1x1.
Camera Control Window, Mode � Light Raw 1x1, Autosave (X # of images) � Expose (X # of seconds)
3. Take a dark frame right before or after
you capture the deep space object.
Camera Control Window, Mode � Dark Raw 1x1, Autosave (3-10 images)
Cover telescope objective.
Camera Control Window � Expose