Great deep image Richard. As usual very impressive exposure times, and that
with the large and sensitive pixels of the FLI camera.

Stefan

"Richard Crisp" schrieb im Newsbeitrag
t...
it took a few more nights than I originally expected due to too much fog
lately, but i now have enough data to at least see what the "Scary Face
Nebula" looks like as a tricolor emission line image shot in Sulfur,
Hydrogen and Oxygen.

this is 6x 20 minutes of Halpha, 7x20 minutes of [SII] and 20x20 minutes
of [OIII]

the [OIII] is a real bear for me due to the object being in my southern
sky and that is right in the middle of silicon valley light pollution.
Plus it is shooting over my roof and is pretty low in the sky.

Adding to the misery is the fact that the [OIII] signal is very faint.
Hence the 20 exposures of 20 minutes.

The [SII] really needs more exposure time too. I had to smooth the layer
to keep the noise under control and I usually don't like to do that. So
more [SII] is the order for the next imaging session.

The Halpha seems fine as is: there's a lot of Halpha strength in this
object.

http://www.narrowbandimaging.com/sh2...2hao3_page.htm