ASTRO: Open Cluster M-50 thru the 20RC

This is a 5:5:5 minute RGB exposure with an STL-1301E CCD camera thru an
Optical Guidance Systems 20-inch Ritchey-Chretien Cassegrain focal reduced
to F/5.

For more info on M-50, see: http://www.kopernik.org/images/archive/m50.htm

George N

George Normandin wrote:

This is a 5:5:5 minute RGB exposure with an STL-1301E CCD camera thru an
Optical Guidance Systems 20-inch Ritchey-Chretien Cassegrain focal reduced
to F/5.

For more info on M-50, see: http://www.kopernik.org/images/archive/m50.htm

George N

RGB colors are much better than the one shot which again has a severe
green cast to it that it didn't have in earlier shots. Not sure why but
even the bright orange stars in this shot are rather green in the DSLR.
Has the white balance setting changed?

This shot has about the same scale as mine though being short exposures
didn't overblow the stars so their colors come through well. I tend to
go too deep on my cluster shots.

So far I have a rare clear night. Hazy with 4" seeing but that's better
than 5" earlier. Snow is supposed to hit tomorrow again. Winter can't
seem to let go here.

Rick

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Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

"Rick Johnson" wrote
....
RGB colors are much better than the one shot which again has a severe
green cast to it that it didn't have in earlier shots. Not sure why but
even the bright orange stars in this shot are rather green in the DSLR.
Has the white balance setting changed?
..........

I'm not sure what is going on here Rick. It might be something to do with
the way IRIS applies flats/darks/bias to DSLR images. In this case I had no
darks, so perhaps the software is doing something. It was also pretty dark
that night so there is very little background signal.

George N

Nice image with good colours George.

Actually my DSLR frames also come out very green when I process them with
IRIS. I usually split them in RGB and do the further processing in AstroArt.

Stefan

"George Normandin" schrieb im Newsbeitrag
...

"Rick Johnson" wrote
....
RGB colors are much better than the one shot which again has a severe
green cast to it that it didn't have in earlier shots. Not sure why but
even the bright orange stars in this shot are rather green in the DSLR.
Has the white balance setting changed?
..........

I'm not sure what is going on here Rick. It might be something to do with
the way IRIS applies flats/darks/bias to DSLR images. In this case I had
no darks, so perhaps the software is doing something. It was also pretty
dark that night so there is very little background signal.

George N

Nice work George!

George Normandin wrote:
This is a 5:5:5 minute RGB exposure with an STL-1301E CCD camera thru an
Optical Guidance Systems 20-inch Ritchey-Chretien Cassegrain focal reduced
to F/5.

For more info on M-50, see: http://www.kopernik.org/images/archive/m50.htm

George N




--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3