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FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
Thread started 02 Jan 2009 (Friday) 10:32
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Rosette - 6 Hours

 
strgazr27
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Jan 02, 2009 10:32 |  #1

I finally had a chance to finish up processing this when I got back yesterday from vacation. This was shot over the course of 2 nights the week before Christmas. I have shot this before with the MN74 and was happy with it but wanted to see what could be done with the ED80. This was shot using the AT .8 reducer. I had to throw out 3 subs due to sat's . This is the remaining 72.

Thanks for looking!

72 X 300 sec @ ISO 800
Darks, Flats and Bias
SW ED80 with AT .8 reducer
Moonlite Focuser w Stepper motor and Temp Compensation
AT-66/SSAG for guiding
EQ-6
Captured, Guided with MaximDl V 5
Calibrated with IP V3
Stacked with Registar
Final processing in PSCS2

A larger image can be seen here : http://strgazr27.zenfo​lio.com/img/v3/p374812​118.tif (external link)

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png' | Redirected to error image by ZENFOLIO PROTECTED

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Sorarse
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Jan 02, 2009 11:40 |  #2

It's images like that that spur me on to improve my own feeble efforts. Very nice photo indeed - you must be pleased with it.


At the beginning of time there was absolutely nothing. And then it exploded! Terry Pratchett

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Celestron
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Jan 02, 2009 21:40 |  #3

Thats a fantastic shot Bobby ! Congrats on a job well done !




  
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chris.bailey
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Jan 03, 2009 03:42 |  #4

Awesome levels of fine detail. Looks like that focal reducer and the ED80 work very well together.




  
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Desertraptor
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Jan 03, 2009 04:56 |  #5

Wow


Peter
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dmmiller
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Jan 03, 2009 07:51 |  #6

Thats gorgeous! :)


Michelle

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drevilsmom
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Jan 03, 2009 08:11 |  #7

Very nice!!


Elizabeth

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Stargazerfrank
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Jan 03, 2009 08:25 |  #8

very nice try but it lacks contrast sky is not ink black use Photoshop do levels adjustment to correct it then it whould be great.


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Sorarse
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Jan 03, 2009 09:07 |  #9

Stargazerfrank wrote in post #6994210 (external link)
very nice try but it lacks contrast sky is not ink black use Photoshop do levels adjustment to correct it then it whould be great.

In reality the night sky isn't ink black, so to show an ink black sky in a photo wouldn't look right.


At the beginning of time there was absolutely nothing. And then it exploded! Terry Pratchett

http://www.scarecrowim​ages.com (external link)
Canon PowerShot G2

  
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strgazr27
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Jan 03, 2009 09:23 |  #10

Thanks for the kind words everyone!

Frank,

As Derek points out, the night sky is not black in images, even under mag 6+ skies. Making the sky background a nice black does nothing really but help hide noise and gives the image a harsh, unnatural look. If you open up the image in PS you'll see that the levels are set at just about the optimal point in the curve without starting to clip data. Another thing to consider is that most of the sky background in the image is faint Hydrogen Alpha emmision that shows as a faint light red/pink. This may be why you don't think it has an ink black background. Thank you though for the input :)


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Celestron
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Jan 03, 2009 16:44 |  #11

Sorarse wrote in post #6994380 (external link)
In reality the night sky isn't ink black, so to show an ink black sky in a photo wouldn't look right.

strgazr27 wrote in post #6994451 (external link)
Thanks for the kind words everyone!

Frank,

As Derek points out, the night sky is not black in images, even under mag 6+ skies. Making the sky background a nice black does nothing really but help hide noise and gives the image a harsh, unnatural look. If you open up the image in PS you'll see that the levels are set at just about the optimal point in the curve without starting to clip data. Another thing to consider is that most of the sky background in the image is faint Hydrogen Alpha emmision that shows as a faint light red/pink. This may be why you don't think it has an ink black background. Thank you though for the input :)

You are absolutely right . No sky no matter how dark is ink black . True the darker the more noise is cleared up but just how much is really noise ?? Just something for all to think on . Thats where multiple stacking as many images as possible does the job replacement of clearing up noise the best way .




  
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Stargazerfrank
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Jan 03, 2009 17:33 |  #12

Sorarse wrote in post #6994380 (external link)
In reality the night sky isn't ink black, so to show an ink black sky in a photo wouldn't look right.

My bad!:oops: I should have said almost ink black sky. Refractors are well know for high resolution I see that in the pic and high contrast I don't see it in the pic the way it is sorry.


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Celestron
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Jan 03, 2009 20:02 |  #13

Stargazerfrank wrote in post #6997096 (external link)
My bad!:oops: I should have said almost ink black sky. Refractors are well know for high resolution I see that in the pic and high contrast I don't see it in the pic the way it is sorry.

Thats' ok , in my SCT the sky is also black and only the stars show , no neb . Hard to see the Neb unless you have a Neb filter . However in my 15x70 binocs i can make out a very dim slightly hazey area around the Rose but no where like what you see M42 in binocs . And your right about refractors being ink black BG and high contrast . I have a Stellarvue AT1010 (80mm , 480mmfl) and it's ink black and high contrast also :) . Refractors do make a difference !




  
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Nightop
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Jan 06, 2009 10:33 |  #14

Great shot!


Greg Willhite
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Nighthound
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Jan 08, 2009 08:14 |  #15

Outstanding image as always Bobby. Nice and deep and refreshing to see this one done as a vertical.


Steve
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Rosette - 6 Hours
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial 
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