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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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srosenfraz
Post Laureate
*****

Reged: 03/06/11

Loc: United States
Reprocessed - NGC 891
      #5611009 - 01/07/13 10:08 PM

I'm still waiting for my mount to come back home from its vacation in Arizona (at Ed Thomas' for tuning and maintenance), so its left me with some spare time to do more reprocessing. This time I used my DSLR-LLRGB workflow to retackle my NGC 891 image from December 2011:




More image information available at http://www.astronomersdoitinthedark.com/index.php?c=113&p=477. Be sure to look at the High Resolution Version, as there's a nice collection of faint fuzzies scattered throughout the field.

This image is from a stack of 190 x 180 seconds (9 1/2 hours total exposure) at ISO 1600 captured with a Gary Honis modified (Baader) Canon 450D. OTA was an orange tube Celestron C-8 using a Celestron focal reducer at f/6.3 (1260mm). Guiding was with an 80mm f/11 refractor, SSAG autoguider, and PHd Guiding.

For those who are curious, here is a link to the prior version.

Thanks for looking!


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fco_star
Carpal Tunnel
*****

Reged: 12/13/10

Loc: Texas, Midland
Re: Reprocessed - NGC 891 new [Re: srosenfraz]
      #5611024 - 01/07/13 10:19 PM

Scott, so many details in your picture, is beautiful!

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shrevestan
scholastic sledgehammer


Reged: 04/19/12

Loc: Shreveport, LA
Re: Reprocessed - NGC 891 new [Re: srosenfraz]
      #5611030 - 01/07/13 10:20 PM

Another winner! Great "3D" feel to it.

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David PavlichAdministrator
Transmographied
*****

Reged: 05/18/05

Loc: Mandeville, LA USA
Re: Reprocessed - NGC 891 new [Re: shrevestan]
      #5611120 - 01/07/13 11:02 PM

I really like it! One of my favorite objects.

David


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Nils_Lars
Postmaster
*****

Reged: 01/04/08

Loc: Santa Cruz Mountains , CA
Re: Reprocessed - NGC 891 new [Re: David Pavlich]
      #5611247 - 01/08/13 12:23 AM

Some sharp details in this Scott.

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mmalik
Postmaster
*****

Reged: 01/13/12

Loc: USA
Re: Reprocessed - NGC 891 new [Re: srosenfraz]
      #5611393 - 01/08/13 06:15 AM

Much better than the previous rendering Scott. Just some thoughts on the star color (NOT about NGC 891 per se); may be soon I'll start processing my images like yours and others but up till now my take is that that saturated star color (predominantly blue, mixed with red/browns [Note: Naturally red/blue shifted star/galaxy colors is NOT what I am referring to here]) gives a hint of over-processing and/or synthetic feel to the images in my opinion. I know you have explained the bluish theme in the other thread already; my comments are not a critique, just something to ponder over and what I feel is quite prevalent in most of yours and other experienced processors' images. May be it is a good thing; I have yet to learn to see it that way . Regards

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jambroseus
professor emeritus


Reged: 04/05/07

Loc: Mount Laurel, New Jersey
Re: Reprocessed - NGC 891 new [Re: mmalik]
      #5611960 - 01/08/13 01:32 PM

Looks great Scott!

John


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: Reprocessed - NGC 891 new [Re: jambroseus]
      #5611971 - 01/08/13 01:40 PM

You are getting great results.

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AstroScience
sage
*****

Reged: 10/28/10

Loc: Israel
Re: Reprocessed - NGC 891 new [Re: Mike Clemens]
      #5611981 - 01/08/13 01:43 PM

Almost missed that one. The galaxy looks beautiful, Scott, tiny details of dusty edge is amazing!

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srosenfraz
Post Laureate
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Reged: 03/06/11

Loc: United States
Re: Reprocessed - NGC 891 new [Re: AstroScience]
      #5612306 - 01/08/13 04:54 PM

Thank you everyone for such nice feedback.

@Mike (Malik) - Thank you for your input and honest critique - Its always helpful to know those aspects of my images where others feel I could improve. You've been cranking out some very high quality images recently, so I wouldn't want to miss such valuable feedback.


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WarrenS
Carpal Tunnel


Reged: 03/04/08

Loc: Orange County New York
Re: Reprocessed - NGC 891 new [Re: srosenfraz]
      #5612491 - 01/08/13 06:44 PM

Very nice Scott, probably one of the nicest DSLR NGC891's I've seen here.

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WhitenerJ
professor emeritus


Reged: 02/06/12

Loc: Waxahachie, Texas
Re: Reprocessed - NGC 891 new [Re: WarrenS]
      #5612740 - 01/08/13 09:17 PM

Great shot!!! Nice detail in the galaxy!!

Jason


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petemumbower
Carpal Tunnel


Reged: 07/12/09

Loc: West Michigan
Re: Reprocessed - NGC 891 new [Re: WhitenerJ]
      #5613670 - 01/09/13 12:46 PM

Amazing what a different round of processing can do with the same set of data. One thing I noticed looking at the high-res is how the stars seem to have blue halo at the 10 o'clock position and a red halo at the 4 o'clock position. Is this just an artifact from the scope optics or reducer?

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srosenfraz
Post Laureate
*****

Reged: 03/06/11

Loc: United States
Re: Reprocessed - NGC 891 new [Re: petemumbower]
      #5614541 - 01/09/13 09:29 PM

Thank you for your kind comments Warren, Jason and Pete. @Pete - there's some chromatic aberration introduced from the focal reducer. I actually used the Lens Correction filter in Photoshop on this image that minimized the CA (it removed most of the CA that radiates away from the center). But, there's some residual channel misalignment. I probably should have cleaned it up a hair more (or not post such high res versions!) - thanks for pointing that out.

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