Quote:
Originally Posted by strongmanmike
In the LRGB, although rather faint, there are several distinct faint features/arcs in the general area between the outer stream arc and the galaxy as well as on the other side of the galaxy above and right, these are not present in your B&W stretched version..? When the LRGB is guassian stretched there is a complete ring of faint material, have a go you'll see it. Extreme stretching a final LRGB will of course show up all the warts and I get that, who cares, I was only doing it to see what these seemingly new features I could see in the LRGB might be.
Please understand, none of this rather extreme manipulation is intended to detract one iota from what is an excellent image of M83 as presented (and the way it was intended to be viewed), I love looking for faint features, heck I have found my share of faint jets and vague extension no one else can see   and you have the prefect instrument and imaging location to find them!
Mike |
Hey Mike! yes I evaluated the differences between the LHaRGB and stretched luminance and found the culprit mask that had not been correctly blurred. I've just uploaded a 'corrected' version. Still has the faint galactic extension and star stream. I also took the opportunity to flatten the background in this new version which appears to have slightly brightened it? and I didn't bother with noise reduction. Oh well...No more repros on this data set. It was test data to start with while the image train was being worked on but I was itching to process something. Thanks for the input. Appreciated.
Quote:
Originally Posted by rustigsmed
very nice work Jason. some great resolution despite the FL esp in Ha. looking forward to seeing more from your new scope.
Cheers
Russell
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Thanks Russ! M83 has been well placed the last few weeks. Crosses the meridian early in the evening so I was able to get most of the data at zenith. I did throw out quite some data due to shotty guiding where by post camera and OAG rotation, I didn't both recalibrating etc. Scope is unchanged as I've posted images from it before, the only new item is the Apogee Aspen CG16070 which I believe is a good match for this set up.
Quote:
Originally Posted by gregbradley
Now we're talking Jase.
Your 16070 leaves that 16000 for dead.
Backgound shows nice contrast star colours are great. A look I now associate with the 16070 and I like it.
Your M83 is very good and perhaps as you say a bit more detail is available with focal length. But I agree with Mike about not writing off your setup for galaxies.
Its an interesting question as to whether there is any real difference between imaging at long focal length and imaging at shorter focal length and cropping with the same aperture.
Greg
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Cheers Greg! Yes, the KAI-16070 is certainly a winner over the KAI-16000. I actually didn't mind using KAI-16000 but the results are better with the KAI-16070 due to its improved well depth. I also requested a class 1 sensor so its very clean. I will consider imaging a couple more galaxies but no promises.