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Old 13-05-2013, 10:01 AM
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gregbradley
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NGC3576 in Hydrogen Alpha

I took this on the last trip to my dark site observatory.

AP140, 6 x 20 minutes, Astrodon 5nm Ha, PMX mount, MMOAG and SBIG STi guided. 1050mm focal length F7.5.

http://upload.pbase.com/image/150155483 crop

http://upload.pbase.com/gregbradley/image/150155471 full frame

The 20 minute exposures were a test and I am happy with the results. It just gives that extra depth with less noise that Ha needs. Even longer subexposures may be even better if the tracking can take it.

I got the other narrowband data for this image as well. So a narrowband version to come if it turns out well enough.

Greg.
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Last edited by gregbradley; 13-05-2013 at 11:50 PM.
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Old 13-05-2013, 11:13 AM
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multiweb (Marc)
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Top shot Greg. I really like the details you've got in the neb at the top of the field though.
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  #3  
Old 13-05-2013, 12:55 PM
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Yes, great capture Greg, some good contrast in those tendrils.

Josh
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Old 13-05-2013, 01:10 PM
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Great work, Greg! Lots of detail there
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  #5  
Old 13-05-2013, 01:11 PM
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Looks good, Greg. Looking forward to the NB version...
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  #6  
Old 13-05-2013, 03:32 PM
Stevec35 (Steve)
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Nice job Greg. Never get tired of this field and you've done it well.

Cheers

Steve
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  #7  
Old 13-05-2013, 05:02 PM
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Quote:
Originally Posted by multiweb View Post
Top shot Greg. I really like the details you've got in the neb at the top of the field though.
Yes, that surprised me. I didn't know there was some more nebula up there.

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Originally Posted by Joshua Bunn View Post
Yes, great capture Greg, some good contrast in those tendrils.

Thanks Josh. This AP scope continues to surprise me.

Josh
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Originally Posted by Larryp View Post
Great work, Greg! Lots of detail there
Thanks Larry. I wasn't expecting the loops to be so well defined. Good skies, sensitive camera and some decent aperture did the job.

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Originally Posted by Stevec35 View Post
Nice job Greg. Never get tired of this field and you've done it well.

Cheers

Steve
Thanks Steve. I hope to be able to get it to look good in narrowband which is always a challenge.

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Originally Posted by RickS View Post
Looks good, Greg. Looking forward to the NB version...
Thanks Rick. I hope it turns out as well in NB too.

Greg.
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  #8  
Old 13-05-2013, 07:08 PM
jase (Jason)
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A very clean and tidy image Greg. Top work! Looks like you've push the data quite hard to display the faint regions which are a delight to see. The data is certainly handling being stretch this way, perhaps as you state the long subs providing a noise free foundation to work with. Would love to check out the completed mission of a narrowband image. Hope you don't keep us waiting too long. Well done.
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  #9  
Old 13-05-2013, 09:48 PM
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marc4darkskies (Marcus)
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That's a ripper Greg - nice composition and depth! You might want to mask the central portions from the stretching though - they're looking a liitle burned out.

Cheers, Marcus
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  #10  
Old 13-05-2013, 11:53 PM
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Quote:
Originally Posted by jase View Post
A very clean and tidy image Greg. Top work! Looks like you've push the data quite hard to display the faint regions which are a delight to see. The data is certainly handling being stretch this way, perhaps as you state the long subs providing a noise free foundation to work with. Would love to check out the completed mission of a narrowband image. Hope you don't keep us waiting too long. Well done.
It was great seeing, a perfectly clear night (I just got 3 perfectly clear, good seeing nights this weekend as well - yah!) and the PMX was humming. 20 minutes is longer than I normally do and I think it paid dividends. 30 minutes on some objects may also be worth it if it doesn't start overexposing. I have all the data. So NB next.

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Originally Posted by marc4darkskies View Post
That's a ripper Greg - nice composition and depth! You might want to mask the central portions from the stretching though - they're looking a liitle burned out.

Cheers, Marcus
Great catch Marcus. I don't know how that slipped through my processing fingers! Corrected. Cheers.
Greg.
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  #11  
Old 14-05-2013, 12:51 AM
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Very beautiful image. I noted that this image is somewhat different from what I caught.
Very similar in details with APOD 2008 March 26.
Congratulations !
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  #12  
Old 14-05-2013, 08:17 AM
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Hi Greg,

An amzing looking monochrome photo.

Sharp and detailed.

I love your tonal range and composition.

Ross.
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  #13  
Old 14-05-2013, 10:35 AM
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Originally Posted by jsmoraes View Post
Very beautiful image. I noted that this image is somewhat different from what I caught.
Very similar in details with APOD 2008 March 26.
Congratulations !
Thanks very much for that. The framing is somewhat accidental in that I was taking a shot to see where the object was and this other nebula up top showed up!

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Hi Greg,

An amzing looking monochrome photo.

Sharp and detailed.

I love your tonal range and composition.

Ross.
Thanks very much Ross. The 20 minute subs seemed to be a winner as long as the tracking holds up which it did. With a guide scope it may be less reliable but this was with a MMOAG which is pretty reliable.
Greg.
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  #14  
Old 14-05-2013, 11:16 AM
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Wonderful image Greg, the detail is great and well processed. The NB version will be stunning I reckon
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  #15  
Old 14-05-2013, 10:08 PM
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Another fantastic image Greg. I love the detail, it is superb.
Lucas
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  #16  
Old 15-05-2013, 09:51 AM
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Top shot Greg - loads of detail and faint nebulosity! Well Done
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  #17  
Old 15-05-2013, 07:08 PM
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Quote:
Originally Posted by SkyViking View Post
Wonderful image Greg, the detail is great and well processed. The NB version will be stunning I reckon
Thanks very much. I hope the NB turns out well.

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Originally Posted by AstroAussie View Post
Another fantastic image Greg. I love the detail, it is superb.
Lucas
Thanks Lucas. The seeing was great, the mount was humming and the scope tends to get out of the way.

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Originally Posted by David Fitz-Henr View Post
Top shot Greg - loads of detail and faint nebulosity! Well Done
Thanks David. I have quite a few images stockpiled to process. Some of them aren't good enough to post. Or I try to accumulate more data to tart them up.

Greg.
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  #18  
Old 15-05-2013, 11:55 PM
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Amaizing stuff Greg, that Hydrogen Alpha imaging is something else
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  #19  
Old 16-05-2013, 07:22 AM
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Amaizing stuff Greg, that Hydrogen Alpha imaging is something else
Thanks Bob. Its a unique look at nebulas. The loops in NGC3576 are pretty spectacular.

Greg.
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  #20  
Old 16-05-2013, 07:01 PM
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Looks great, Greg!
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