Stack of 29 x 5 minutes exposures (February 9, 2008)
Left, simple logarithm display, right, high contrast display
WIDE FIELD
Halpha
or the
challenge of imaging under a Light-Polluted Sky
Lens: Canon 85 mm f:1.2 L @
f:2.
Camera: Modified Canon 40D at ISO200 (see
modification nature here). An Halpha 7 nm Baader filter is in place
front
to the lens (2 inch diameter). We use only the red channel of Canon
CR2 RAW files.
Processing: Iris
software. Observatory: Castanet-Tolosan (near Toulouse town (south of France) -
Eye limit magnitude of 3).
Barnard loop
and Messier 42 region
Stack of 29
x 5 minutes exposures (February 9, 2008)
Left, simple logarithm display,
right, high contrast display
NGC 2264 (Cone
nebula) and NGC 2246 (Rosette nebula) region
Stack
of 25 x 5 minutes exposures (February 8, 2008)
Left, simple logarithm
display, right, high contrast display
IC 405 and IC
410 region
Stack of 13 x
5 minutes exposures (February 8, 2008)
Left, simple logarithm display, right,
high contrast display
NGC 2327 and
IC 2177 region
Stack of 12 x
5 minutes exposures (February 9, 2008)
Left, simple logarithm display, right,
high contrast display
From up to down,
Messier 35 open cluster, IC 443 nebula, and NGC 2174 nebula, SH2-254 nebula,
SH2-261 nebula
Stack of 14 x
5 minutes exposures (February 8, 2008)
Left, simple logarithm display, right,
high contrast display
SH2-240
(Simeis 147) nebula
Stack of 30 x
5 minutes exposures (February 10, 2008)
Up, simple logarithm display, down,
high contrast display
The bright object is Mars planet.
See also here