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M51 LRGB

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Lex:
BTW;

do you think it could be possible to show us a non-cropped version? I tried to image M51 with a 90mm f/6 triplet also but the galaxy turned out as a flea  >:D

jeffweiss9:
Thanks very much, Lex-
  Yes, the APM 130/780 is a triplet APO at f/6.0 with the LZOS TMB lens set.
There wasn't too much cropping but the full frame is at

http://www.flickr.com/photos/9906726@N08/7179306270/in/photostream/lightbox/

Clear skies,
-Jeff

Lex:
Okay,

Thanks for the info!

I had to crop about 4/6 of the surrounding background to see M51 closer, perhaps due to the pixelsize or the binning factor differencies...

jeffweiss9:
This is an HaLRGB version with 3.6 hrs of Ha added for 11.1 hrs total but it is really only Ha-enhanced due to high sky background in the Ha data (need longer subs, I believe):

http://www.astrophotogallery.org/showphoto.php?photo=9572&cat=500&title=m51-halrgb

The galaxy still tends toward the cyan but looking at a number of PI processed image of this (and other galaxies), it appears to me that the cyan is predominantly from the PI ColorCalibration process that uses the myriad stars and star types in the galaxy to set the white rather than pretending deep space objects would have a color balance with white set by a G2V star like the sun.

-Jeff

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