America & Pelican Nebulas in Cygnus
This CCD image combines
the H-alpha image as the luminance layer with a standard RGB color layer.
Unfortunately, the quality of the color frames did not match that of the H-alpha
frames and the lens used exhibits coma. The H-alpha image as a grayscale is here.
Since H-alpha light is in the deep red part of the spectrum (656.3 nM) we can
also substitute the Ha image for the red image and generate an Ha-G-B in the
same way as an ordinary RGB. The effect of this substitution can be seen here
(Ha-G-B) in rough form.
(H-alpha), 06-29 (RGB)
80-200mm zoom at 200mm, f/4 on
on ST-10 XME/CFW-8a with Mandel Adapter;
A-P 1200 GTO mount
H-alpha: 16 x 10 minute
unbinned frames, Custom Scientific
RGB: 5 x 5 minute 2x2
binned frames, SBIG filters.
Ha: Calibrated and
combined, then mild low pass DDP applied in MaxIm. RGB: Colors
stacked in MaxIm, then
registered in RegiStar and color combined to RGB in MaxIm. Size doubled
then registered with Ha
image in RegiStar. Ha and RGB combined, levels adjusted,
and mild unsharp mask
and blur applied in Photoshop 6.
to New Stuff
to Film Version