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#3126 Censustaker

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Posted 18 September 2015 - 02:23 PM

Ah - you know what - I forgot to mention - I was using an Baader UHC filter.



#3127 photo444

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Posted 18 September 2015 - 02:45 PM

It may be a good idea to specify what the black level in % is compared to the full 100% brightness.  Every one has own liking tied to performance of particular display devices as Mark said. 

 

I have played with Jon's and Hiten's pictures to demonstrate the role of background.  I hope Jon and Hiten may forgive me in doing so.

 

I used Processing to plot brightness profile to see how much background is. Left vertical line is brightness=0, and the right vertical is brightness=255 full scale.

 

The background of Jon's frame is not flat at all, and this is my problem.  What is needed is to subtract dark frame(s) instead of shifting histogram.

SQ Jon.JPG-ann.JPG

 

I little bit processed Jon's picture to reduce the background. Stars are overly saturated and noisy.

SQ Jon-C-ann.JPG

 

Hiten's picture shows that the background was overly clipped away.

SQ Astro-ann.JPG

 

A few of software indeed can subtract dark frames (AstroVideo is one of them) but takes more cumbersome operation to get dark frames.

 

Paul


Edited by photo444, 18 September 2015 - 02:55 PM.


#3128 photo444

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Posted 18 September 2015 - 02:48 PM

With my LN300 PAL, I always get uneven background. Filters do  not change the variation of the background.



#3129 photo444

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Posted 18 September 2015 - 02:51 PM

I like Charles' pictures in this respect. Very dark and even background.  Perhaps real dark sky is the answer.



#3130 mclewis1

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Posted 18 September 2015 - 03:02 PM

I like Charles' pictures in this respect. Very dark and even background.  Perhaps real dark sky is the answer.

It's the answer to just about all of our questions in EAA ... lol.



#3131 Astrojedi

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Posted 18 September 2015 - 03:18 PM

It may be a good idea to specify what the black level in % is compared to the full 100% brightness.  Every one has own liking tied to performance of particular display devices as Mark said. 

 

I have played with Jon's and Hiten's pictures to demonstrate the role of background.  I hope Jon and Hiten may forgive me in doing so.

 

I used Processing to plot brightness profile to see how much background is. Left vertical line is brightness=0, and the right vertical is brightness=255 full scale.

 

The background of Jon's frame is not flat at all, and this is my problem.  What is needed is to subtract dark frame(s) instead of shifting histogram.

attachicon.gifSQ Jon.JPG-ann.JPG

 

I little bit processed Jon's picture to reduce the background. Stars are overly saturated and noisy.

attachicon.gifSQ Jon-C-ann.JPG

 

Hiten's picture shows that the background was overly clipped away.

attachicon.gifSQ Astro-ann.JPG

 

A few of software indeed can subtract dark frames (AstroVideo is one of them) but takes more cumbersome operation to get dark frames.

 

Paul

 

Paul,

 

Don't mind at all :) . My surface tablet's display is very bright which is why I suspect I set the black level is so high.

 

Since these are JPGs a lot of the information is already lost so in essence you cannot 'go back'. I have tif files from the viewing session. Will redo the black levels and repost.

 

Hiten



#3132 Dom543

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Posted 18 September 2015 - 03:19 PM

Another example, when a separate thread would have served better than carrying on all the discussion on the gallery thread. With a suitably chosen title, one could even find later the discussion about the pros and cons of the different background black levels.

 

Clear Skies!

--Dom



#3133 Astrojedi

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Posted 18 September 2015 - 03:34 PM

Stephan's Quintet.. second try

 

Stephans Quintet 27x10s 3.jpg


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#3134 photo444

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Posted 18 September 2015 - 03:39 PM

Another example, when a separate thread would have served better than carrying on all the discussion on the gallery thread. With a suitably chosen title, one could even find later the discussion about the pros and cons of the different background black levels.

 

Clear Skies!

--Dom

Dom,

 

I was thinking about that, too. May be the discussion is over.

 

Paul



#3135 nytecam

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Posted 18 September 2015 - 03:48 PM

Couple of planetaries in M57 [60s] and M27 [80s] from last night in stacked 20s subs - flats/darks used.

Nytecam

Attached Thumbnails

  • m57c150917x60shmg.jpg
  • m27c150917x80shmg.jpg

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#3136 Astrojedi

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Posted 18 September 2015 - 03:56 PM

And here is NGC891... hopefully the dark levels are coming across properly.

 

NGC891 35x10s 3 resize.jpg


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#3137 Censustaker

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Posted 18 September 2015 - 04:36 PM

Dark site is the key! I stacked 60 frames of NGC891 and could barely see the core.



#3138 Censustaker

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Posted 18 September 2015 - 04:37 PM

It may be a good idea to specify what the black level in % is compared to the full 100% brightness.  Every one has own liking tied to performance of particular display devices as Mark said. 

 

I have played with Jon's and Hiten's pictures to demonstrate the role of background.  I hope Jon and Hiten may forgive me in doing so.

 

I used Processing to plot brightness profile to see how much background is. Left vertical line is brightness=0, and the right vertical is brightness=255 full scale.

 

The background of Jon's frame is not flat at all, and this is my problem.  What is needed is to subtract dark frame(s) instead of shifting histogram.

attachicon.gifSQ Jon.JPG-ann.JPG

 

I little bit processed Jon's picture to reduce the background. Stars are overly saturated and noisy.

attachicon.gifSQ Jon-C-ann.JPG

 

Hiten's picture shows that the background was overly clipped away.

attachicon.gifSQ Astro-ann.JPG

 

A few of software indeed can subtract dark frames (AstroVideo is one of them) but takes more cumbersome operation to get dark frames.

 

Paul

 

Thanks, this is pretty useful. Also: awesome use of Processing. 



#3139 photo444

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Posted 18 September 2015 - 05:20 PM

Jon,

 

You are welcome!



#3140 Astrojedi

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Posted 20 September 2015 - 11:54 AM

A couple of globs from last night... Both using C8 @ f3.5, ASI224, LP filter and AstroToaster.

 

You can tell the difference in the age of the stars... M13 is a lot younger with a bluish/white core... M14 the stars are a lot yellower...

 

The light pollution filter really helps.... allows me to push the gain higher... Within the first 2-3 frames I could see the color and each star resolved... Really got a 'live' feel... similar to what I felt the first time I looked through a video camera... but much better resolution

 

M13 22x10s

 

M13 22x10s Resized.jpg

 

M14 27x10s

 

M14 27x10s Resized.jpg


Edited by Astrojedi, 20 September 2015 - 11:54 AM.

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#3141 Dom543

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Posted 22 September 2015 - 01:08 AM

Dumbbell with APU-1

Two images for comparison from my second light with the APU-1 camera on Saturday.

 

First Integration=x256 (4sec), Gain=52 (80%). This corresponds to the recommended settings for the camera.

Dumbbell_20150919_222415_x256g52.jpg

 

The second example is not justified (not needed) for the bright Dumbbell nebula.

But with the camera being new, I had to try out its unlimited integration mode.

Integration=1min, Gain=12 (18%), single frame (no stacking).

Dumbbell_20150919_230638_1minG12.jpg

 

I used my Meade 10" SCT at around f4 on an unguided CGEM mount for both captures.

 

Comments, questions or suggestions are welcome.

Please use this thread http://www.cloudynig...-1-first-light/ to leave this gallery for images.

 

Clear Skies!

--Dom

 


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#3142 StarMike8SE

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Posted 22 September 2015 - 07:11 AM

Dumbbell with APU-1

Two images for comparison from my second light with the APU-1 camera on Saturday.

 

First Integration=x256 (4sec), Gain=52 (80%). This corresponds to the recommended settings for the camera.

attachicon.gifDumbbell_20150919_222415_x256g52.jpg

 

The second example is not justified (not needed) for the bright Dumbbell nebula.

But with the camera being new, I had to try out its unlimited integration mode.

Integration=1min, Gain=12 (18%), single frame (no stacking).

attachicon.gifDumbbell_20150919_230638_1minG12.jpg

 

I used my Meade 10" SCT at around f4 on an unguided CGEM mount for both captures.

 

Comments, questions or suggestions are welcome.

Please use this thread http://www.cloudynig...-1-first-light/ to leave this gallery for images.

 

Clear Skies!

--Dom

That is what I am discovering.  The longer integration and lower gain seem to give better smoother images.  I may need to get an autoguider  . 



#3143 Astrojedi

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Posted 23 September 2015 - 11:52 AM

The Moon last night made viewing any object with low surface brightness next to impossible... so went back to a couple of brighter DSOs

 

ASI224, with C8@f3.5 on an Alt Az mount (using a LP filter).

 

M27: 25x10s

 

Looked amazing on the monitor... Some of the more subtle detail is lost in the the JPG compression... but you get the idea (Edit: click on the image for full size)

 

M27 25x10s.jpg


Edited by Astrojedi, 23 September 2015 - 11:53 AM.

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#3144 Dom543

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Posted 23 September 2015 - 06:43 PM

Nice capture Hiten!

 

What software are you using to process images captured with the ASI cameras? Do they have their own software or are you using AstroToaster or an other generic package? Also is stacking 25 frames really needed? Do you see noticeable improvement between stack 20 and stack 25? I am asking this because my experience with software based EAA cameras (Lodestar) is that a stack of 3-5 is the max to yield noticable improvement.

 

Thank you,

--Dom


Edited by Dom543, 23 September 2015 - 06:47 PM.


#3145 Dom543

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Posted 26 September 2015 - 01:51 PM

Ring Nebula with APU-1

 

I include two captures of the Ring nebula from last weekend. These are raw captures off the camera with no software involvement.

Also please keep in mind that this was the third night in my life with a long integration analog camera.

 

First is a "Frame integration mode" capture with x256 and gain 42 (70%).

Ring_20150919_232612_x256g42.jpg

 

For comparison here is an "Unlimited integration mode" capture with 1 min exposure and gain 12 (20%).

Ring_20150919_234403_1minG00.jpg

 

Both images were taken with a 10" SCT at around f4 and with no filters from an intestate rest stop outside of Seattle. (The city was covered with clouds.)

 

Clear Skies!

--Dom


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#3146 A. Viegas

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Posted 26 September 2015 - 02:00 PM

Wow, Dom I am impressed from an interstate rest stop?  wow... now that is dedication!  :bow:

 

Al



#3147 Dom543

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Posted 26 September 2015 - 02:06 PM

Bubble Nebula with APU-1

 

This is the final image from my stopover in Seattle last weekend.

 

Taken with a 10" SCT at f4 and a 7nm H-alpha filter from a rest area on Interstate 90.

Integration x1024 (17sec) and gain 58 (close to the max of the "frame integration mode").

Bubble_20150920_003902_x1024g58.jpg

 

The plan was to also take the same shot with 1 min exposure in "unlimited integration mode" for comparison.

But my corrector fogged up and the clouds that were covering the city were also moving over to our area.

So sadly, we had to pack up and drive home with no comparison image.

 

For comments, questions and suggestions please use this thread http://www.cloudynig...-1-first-light/ to leave the gallery mostly for images.

 

Clear Skies!

--Dom


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#3148 Astrojedi

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Posted 26 September 2015 - 03:09 PM

Dom,

These are good shots and from a rest stop. Very impressed.

 

Actually, I have found myself wanting a scope many times at rest stops. Some of them have really dark skies.

 

Hiten



#3149 Astrojedi

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Posted 28 September 2015 - 12:20 AM

Took advantage of the Lunar eclipse today to do a brief galaxy hunting session...

 

NGC7331_2015.9.27_20.40.12.png

 

 


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#3150 Dom543

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Posted 28 September 2015 - 11:26 AM

Wizard Nebula with APU-1

 

I used the hour while the full moon was eclipsed to steal this capture straight off the camera.

Wizard_20150927_215313_1min-32gain.jpg

This is "unlimited integration" mode that has no in-camera stacking. The exposure is 1 min and gain is 32 (50%).

 

"Frame integration mode" x1024 would have been a viable alternative with a higher gain setting (~90%). But the longer integration shows more detail and depth. I posted my personally favored capture of the same nebula from a few minutes earlier on the discussion thread. It shows the elaborate web that makes up this nebula in more detail. But it has lower brightness and hence comes through on the bright CN background less well.

 

Equipment used: Meade 8" SCT at f2 on CG-5 mount and with 7nm H-alpha filter.

The capture was taken from the fire escape of the building where I work in Massachusetts just outside of Boston. Here is the photo of my perch at daytime from last year. Now I use the APU-1 instead of the Lodestar on the photo.http://www.cloudynig...etup/?p=6241876

 

Please use the discussion thread http://www.cloudynig...ight/?p=6807152 for questions, comments or suggestions to keep this gallery mostly for images. You can also see my favored capture of the wizard at the linked post.

 

Clear Skies!

--Dom


Edited by Dom543, 28 September 2015 - 12:58 PM.



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