Ngc6188 ngc6164

[gregbradley]

This is a fairly deep image of this classic southern target.

HaLRGB image with some O3 in the NGC6164 section. Just under 40 hours total exposure for the whole image.

http://www.pbase.com/gregbradley/image/163348082/large regular size

http://www.pbase.com/gregbradley/image/163348082/original large size


Greg.

[Atmos]

:eyepop: Really need to see this on my computer and not my iPhone!

Really nice Greg!

[gregbradley]

Thanks Colin. The large image is quite detailed and immersive. The Proline and the RHA work well together.

Greg.

[DJScotty]

Very nice image Greg.

Great detail. Nice colours.

I think I might have a crack at this one next.

Cheers.
Scott :thumbsup:

[RickS]

Nice to see in RGB for a change, Greg. Very big, bold and detailed.

Cheers,
Rick.

[strongmanmike]

Ha ha whew, check that out! ...niiiice. I Like the contrasting blue you went with for the outer envelope around the magic dragon egg.

Jeez, 40hrs though?...with 12" at F3.8 not sure ya really needed that much :eyepop:...but hey, I guess if ya can ...ya can :thumbsup: :)

Mike

[gregbradley]

Thanks very much Scott. I have been working to improve my images recently and am happy with some progress there. A big help was getting a new monitor and calibrating it. Some images look very different through the calibrated monitor. My laptop even when calibrated like I have been is still not that close and shows images in too cool a temperature.



Thanks Rick. Yes that's right. Although I did do a narrowband version of this as well as I had all the data.



Cheers Mike. Several successful nights add up pretty quickly.

Greg.

[Peter Ward]

Sorry Greg...I'm going to be brutally frank on this one...

As Maxwell Smart was fond of saying "missed it by that much"

I've taken the liberty of uploading a section of your image to illustrate my point...weird-purple dots at 2 o'clock ...which I guess are Red/Blue registration errors. Stars are a tad elongated...but hey...many including yours truly... often don't nail that down.

Getting back to the registration error, it will kill correct star colouration, with many of them looking a bland white, rather than reflect their true colour-temperatures.

You've also got a horizontal row CCD blemish...about 1/3rd the way down the chip that could be easily taken out with a bad pixel map.

The nebula colours are pastel looking to my eye, and the dynamic range of the data looks both clipped and compressed...more the pity... as you totally nailed the framing :thumbsup:

That said, I can see that sublime AP RHA singing an Aria for you soon :)

[gregbradley]

I checked this again and yes you are right and my mistake. I have processed this image a lot over a period of time and I have mistakenly posted the wrong version. I had detected the registration error at some point and went back and reregistered the images. As I recall I ended up using PixInsight for the reregistration as for some reason CCDstack was not doing a good enough job. I think perhaps because I was subtlely adjusting tilt/tip on the fly over several nights and it may have shifted the geometry a tad and PI could handle that but not CCDStack. Anyways check out the image again and the stars are all nice and pastel coloured and no registration errors to speak of. I did not notice the line when I looked. Usually that dark subtracts or bias subtracts out but occasionally they can be pesky. CCDstack is not particularly user friendly for removing lines. Perhaps PI may become my default registration software as I believe it removes lines much more easily.

As far as colours being too pastel on my newly calibrated external monitor (Samsung LED) it seems quite vivid but on my laptop it does not and does look pastel. So if the consensus is that its quite pastel overall I would love to know as I trying to gain confidence with this new monitor.

Same links.

Greg.

[Placidus]

Wow! As Strong Mike says, the OIII shell around the Norma Bipolar Nebula really stands out. When we see these beasts one at a time, it's hard to get a feel for their relative brightnesses. A very nice study. The mega-data 40 hours means that the subtleties of the background are pretty well nailed too.

[gregbradley]

Thanks very much Mike. I just posted the correct version that has at least to my eye no registration, colour issues. Some star shapes may not be 100% perfect over the whole image but overall very round and I am at this stage very happy with it.

Greg.

[marc4darkskies]

The updated version / posting looks great Greg. :thumbsup:

Any chance of seeing a full res version?

[gregbradley]

Thanks Marcus. I am sure you also do many versions of your images before you are happy with them. This one in particular had many many versions hence my confusion. I need to improve my labelling and folder organisation.

Yes I can post a larger version tomorrow. The vast bulk of the data was taken in Kurrajong as well.

Cheers,

Greg.

[Rod771]

The Colour looks good on my monitors Greg! Nice work! :thumbsup:

[gregbradley]

Thanks Rod. When you've been accustomed to slightly off colour from a Laptop that has a cool temperature and everything is bit cool and bluish it seems too red and vivid. But terrestrial photos colour looks normal.

Greg.

[gregbradley]

22.1mb image nearly 4000 x 4000 pixels.

http://www.pbase.com/image/163613667/large


http://www.pbase.com/image/163613667/original largest size.


Greg.

[DJScotty]

I thought the original image was good. That is sublime. So much sharper and detailed. The colours look great on my monitor (LG IPS LED)

Excellent work :thumbsup:

[gregbradley]

Thanks very much Scotty for the nice compliment.

Greg.

[strongmanmike]

I agree, the rework looks good :thumbsup: I imagine the slightly wonky stars across the top is some image plane tilt..? Do you notice the severity varies slightly across the sky?

Mike

[gregbradley]

Hi Mike,

Hard to say if it varies. Yes its tilt and something I was adjusting from night to night to tweak. I got it to the point of excellence after several nights. A lot of the data has beautiful round stars everywhere but some had some elongations in one corner. I can't say it varied much across the sky though. Perhaps a bit yes, but not too much. I find adjusting for tilt quite a challenge on my scopes with the 16803 sensor. But its worth it when its spot on.

Greg.

[Paul Haese]

I like the updated version Greg with a smaller resolution. You certainly have some tilt in the top left, but it is still a nice looking image. I like the colour too.

[gregbradley]

Thanks Paul. The tilt is smaller than you would think. It was probably only 0.12mm! I think the large sensor shows tilt up more than the smaller sensors that are popular so just like long focal length makes everything harder so does large sensors. Just another factor to conquer! This pursuit is part mechanic for sure.

Greg.

[Retrograde]

Nice change to see this object in HaLRGB. Great stuff Greg!

[gregbradley]

Thanks Pete. I also did a narrowband version which I haven't posted yet:eyepop: But I don't like it as much as the HaLRGB version.;)

Greg.

[atalas]

Another region I enjoy Greg....fine work.

[gregbradley]

Thanks Louie. I am still using the data from your tutorials. I probably used it on this image!

Greg.