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#2726 Dom543

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Posted 17 March 2015 - 07:30 PM

Multi-color Narrowband in LodestarLive

 

We start with a live-stack of three 60sec Oiii frames of Thor's Helmet.

Attached File  1.Thor.s.Helmet_3x60sOiii_2015.3.16_22.13.57.jpg   174.76KB   10 downloads

 

Then we change filters to an H-alpha and continue the live stacking.

This is what we get as 3x60sec Oiii + 1x60sec Ha.

Attached File  2.Thor.s.Helmet_3x60sOiii+1x60sHa_2015.3.16_22.41.21.jpg   146.96KB   8 downloads

 

We continue stacking another Ha frame.

This is 3x60sec Oiii + 2x60sec Ha.

Attached File  3.Thor.s.Helmet_3x60sOiii+2x60sHa_2015.3.16_22.20.08.jpg   156.69KB   9 downloads

 

We reached the file size limit of CN post, so we stop here.

By the way, a third Ha frame would overwhelm the more subtle Oiii. The trick is to use Ha sparingly.

 

It is fun to watch in live as the metallic helmet transforms into a pink snail that eats up the green vegetation and finally flies away as an owl under the night sky (or in nightly snow fall?). Credit and thanks for the snail interpretation to Martin Meredith and for the owl to an anonymous kid in the dark at an outreach event.

 

Please feel free to pick your favorite mix of Oiii and Ha.

 

Clear Skies!

--Dom

 

Equipment used: C11 with an improvised focal reducer, TS filter drawer, Baader 7nm Ha and 8.5nm Oiii filters, Lodestar x2c and LodestarLive v.0.11.


Edited by Dom543, 19 March 2015 - 03:23 PM.

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#2727 Don Rudny

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Posted 17 March 2015 - 11:39 PM

Great job, Dom.  This is a very difficult object to get in any kind of image, yet alone in stunning color.  I like them all!

 

Don



#2728 A. Viegas

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Posted 18 March 2015 - 02:53 PM

Very nice Dom.   The second frame looked the best to me, maintaining the wispy Oiii tendrils and adding that subtle Ha color.   Very well done, and nicely framed too.   What are your sky conditions? Seems like you have dark skies?

Al



#2729 Dom543

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Posted 19 March 2015 - 03:18 PM

Thank you for the comments and likes.

 

It's true that right now we are close to new moon now and I only have to worry about a handful of street lights and neighbors porch lights. But I believe that one of the major advantages of the use of narrowband filters for EAA is that it liberates us from the negative effects of light pollution and sky glow.

 

I did some experimentation with the H-alpha filter during the full moon period in January. The experience was encouraging and some captures are posted in the thread

http://www.cloudynig...s/#entry6404879

And also on the previous two pages (pp.108-109) of this gallery under the heading "Daring the Full Moon with H-alpha".

 

Cameras with the newest high sensitivity sensors and software with powerful registered sum-stacking algorithms open up new horizons to explore for us in EAA.

 

Clear Skies!

--Dom


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#2730 John59

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Posted 23 March 2015 - 04:57 PM

Hi everyone!

I finally had a clear night and the temperatures are getting warmer making it more comfortable to stay out longer.
I took a few last night before the dew became too big of an issue.
Also you will have to excuse the two bright Hot pixels that are very bothersome.  I have to remember to place the object of interest off to the side if possible.  I do try to remove them in my Flickr and Face Book posts as I really hate them. For the sake that this is suppose to be presentations that are we see them (no post processing) you get to share my frustration.
Also keep in mind I am in a red zone sitting under a streetlight that is only 50 feet away.
All the below captures are with the following:
Telescope – ES AR152 Refractor
Camera – Astro-Video Systems MK IV
Reducer – Astro-Systems vari-reducer configured to .63
Filter – Orion WB Imaging filter

I have stated the integration time and in camera stacking in each capture post below.
First up is the Whirlpool galaxy.
I over saturated this one to try an get more of the arms.
However this started producing banding.
Also I forgot to move the telescope enough to get the bright pixels out of the object.
I do like the the details that are showing up in the arms.
INT 512
Gain 63
AGC High
In Camera stacking set to 5

Attached Files



#2731 John59

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Posted 23 March 2015 - 04:59 PM

This second Whirlpool is better in some respects.
No banding and the hot pixels moved towards the object edge.
However arms are not showing as much detail.
INT 256
Gain 63
AGC High
In Camera stacking set to 5

 

 

Attached Files



#2732 John59

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Posted 23 March 2015 - 05:00 PM

This is the Sunflower Galaxy
Again I forgot to move the object to not be in the Hot Pixel area.
They really spoil the presentation.
However you can see the tight arms spiraling out from the core.
This is another really nice galaxy to view.
INT 256
Gain 63
AGC High
In Camera stacking set to 5

Attached Files



#2733 John59

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Posted 23 March 2015 - 05:01 PM

This is the Spindle Galaxy and one of my favorites.
This one came out really nice.
The edge on galaxy shows good detail with plenty of contrast. I especially like how the core shows a nice dome with the gas lane split showing faintly out to the arms as well.
INT 256
Gain 63
AGC High
In Camera stacking set to 5

Attached Files



#2734 John59

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Posted 23 March 2015 - 05:02 PM

This is M101 and one of my better captures for this one.
The spiraling arms are just beginning to show some nice detail.
INT 256
Gain 63
AGC High
In Camera stacking set to 5

 

Attached Files

  • Attached File  M101.jpg   99.05KB   5 downloads


#2735 John59

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Posted 23 March 2015 - 05:02 PM

This is the Black Eye Galaxy.
The central area is fairly easy to capture.
However the outer tightly spiraling arms are harder without blowing out the core.
This is about the best I managed last night.
You can see the core is starting to blow out and banding is creeping in.
INT 128
Gain 63
AGC High
In Camera stacking set to 5

 

Attached Files



#2736 nytecam

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Posted 25 March 2015 - 12:22 PM

Nice work - shame the double hot pixel is near centre of frame and difficult to avoid.



#2737 Relativist

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Posted 25 March 2015 - 01:13 PM

Hey April first is coming and you might have use for that hot pixel... (looks like it could be a SN!)



#2738 Dom543

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Posted 27 March 2015 - 12:24 AM

A couple of multicolor narrowband variations on the "red" Rosette.

First pure Oiii exposures only.
Attached File  Rosette_4xOiii+0xHa_2015.3.20_22.34.59.jpg   203.73KB   2 downloads

Next 3x Oiii +2x Ha but with the brightness of the red Ha channel scaled to half of the blue and green Oiii channels to avoid domination by the strong Ha signal.
This results in a true multi color representation of the nebula.
But, of course, the proportions and the balance of the colors is at the will of the "artist".
Attached File  Rosette_3xOiii+2xHa_2015.3.20_22.42.57.jpg   206.92KB   1 downloads

The technique is to live sum-stack multiple images and at the end to scale back the brightness of the resulting stack to the original brightness of a single frame. As Don Rudny, Kyle Goodwin and others have discussed it in this thread http://www.cloudynig...-mean-stacking/, this is essentially equivalent to average (mean) stacking.

To get the second image we first added up three Oiii frames, then changed filters to Ha and added two more Ha frames. Finally we scaled back the brightness of the stack to that of a single frame.

Due to file size limitations, continued in the next post.
--Dom

#2739 Dom543

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Posted 27 March 2015 - 12:49 AM

Now we add equal portions of Oiii and Ha. But in the first image the brightness of the red Ha channel is half of the brightness of the green-blue Oiii channels.
Attached File  Rosette_4xOiii+4xHa_2015.3.20_22.57.13.jpg   195.17KB   0 downloads

Finally equal portions of Oiii and Ha and each of them allowed to contribute their own natural brightness.
Attached File  Rosette_4xOiii+4xHa-eq_2015.3.20_22.59.28.jpg   152.19KB   0 downloads

This is the closest of the usual red image of the Rosette. But in fact, it is composed of the superposition of two narrowband images. You may want to compare this to the pure Ha images that I posted in January http://www.cloudynig...s/#entry6404879 and decide, if the multiband image contains more detail or is more pleasing or not worth the extra effort.

Equipment used:
Nikkor 180mm f2.8 photo lens, TS filter drawer, Baader 8.5nm Oiii and 7nm Ha filters, Lodestar x2c camera with LodestarLive v0.11 software. All images were recorded during the same live observation session.

The purpose of this whole exercise is to experiment with adding colors and fun to the live EAA sessions and possibly gain a better insight into the structure of the objects.

Clear Skies!
--Dom
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#2740 Vondragonnoggin

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Posted 27 March 2015 - 06:15 AM

Nice work Dom! It is very interesting to see the various compositions. Looks like fun too.




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