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Old 29-04-2010, 09:18 PM
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Horsehead in Ha AP140

Here is one I took a few weeks ago.

The Horsehead Nebula in Ha before it is gone for the year.
17 x 10 minutes. AP140 with 155TCC giving F5.7. Proline 16803.

http://upload.pbase.com/image/124055594

Greg.
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  #2  
Old 29-04-2010, 09:45 PM
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Congratulations on a fantastic shot.

Mark
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  #3  
Old 29-04-2010, 09:57 PM
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Great shot Greg. It's an interesting target because the background nebulosity can appear as blotchy noise in some images when in fact it is detailed clouds of gas that clearly show up in this image.

The detail in the pillars between the horse and the flame is amazing.

Peter
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  #4  
Old 29-04-2010, 10:21 PM
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My wife says "Wow - who's is that?"
Fortunately leaving out - "yours never look that good"

Wonderful shot Greg.
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  #5  
Old 29-04-2010, 10:30 PM
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Quote:
Originally Posted by peter_4059 View Post
.....the background nebulosity can appear as blotchy noise in some images when in fact it is detailed clouds of gas that clearly show up in this image.
Oh bugger it.....I was going to be PC and shut up, but, sorry, the noise is obvious. This area of the sky has been imaged many times before....eg

http://www.atscope.com.au/BRO/images/nb/MrEd.jpg

Good effort just the same.
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  #6  
Old 29-04-2010, 10:56 PM
Hagar (Doug)
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Nice image Greg. What a whoppin big field of view. It fits it all plus a bit in. I just wonder if maybe you have stretched it a bit hard and lost a bit of the contrast. I hope you don't mind I had a little play to lift the contrast a little. If you dont like it I can remove it.
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  #7  
Old 29-04-2010, 11:21 PM
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I've posted a less pushed version now. I disagree that it was noisy, there is actual structure in the gas clouds as long exposures reveal. Have a look at Rob Gendlers images of the area and you'll see that same structure. There was a bit of graininess in the left side but I thought the revealed structure was worth it. So to some degree a point of view.

Still another few hours would have smoothed it further and enabled that level of stretch without that bit of graininess. I wouldn't call it obvious and perhaps it is better to be PC and not post critical comments which is typical of your posts Peter.

Greg.
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Old 29-04-2010, 11:36 PM
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Nice Ha image Greg. Field is huge mate.
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  #9  
Old 29-04-2010, 11:40 PM
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Quote:
Originally Posted by gregbradley View Post
......I wouldn't call it obvious and perhaps it is better to be PC and not post critical comments which is typical of your posts Peter.

Greg.
I would have guessed you'd know me by now...I call a spade a shovel.

What I did say was: "a good effort". Plus the noise was obvious. (sorry, it was/is)

Typical of me? Maybe. Terse....I think not. Take it easy.
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  #10  
Old 30-04-2010, 01:16 AM
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Greg, Your image has a great "3D" look to it that the others dont seem to display. I like yours the best
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Old 30-04-2010, 09:13 AM
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Quote:
Originally Posted by gregbradley View Post
I've posted a less pushed version now. I disagree that it was noisy, there is actual structure in the gas clouds as long exposures reveal. Have a look at Rob Gendlers images of the area and you'll see that same structure. There was a bit of graininess in the left side but I thought the revealed structure was worth it. So to some degree a point of view.
That version is superb! That's a massive square field. Real real good details in there.
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  #12  
Old 30-04-2010, 02:34 PM
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renormalised (Carl)
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Huge FoV!!!....Great shot, Greg. Always love Ha shots
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Old 30-04-2010, 03:18 PM
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It's an interesting comparison but I know which version I prefer - great image Greg.
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Old 30-04-2010, 03:56 PM
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Quote:
Originally Posted by peter_4059 View Post
It's an interesting comparison but I know which version I prefer - great image Greg.

Well for comparison purposes here are the 2 versions:

the original with the lighter background showing all the gas and its details but less contrasty and a bit of graininess in the left side
A:
http://www.pbase.com/image/124074995

And the 2nd version with a darker background, less detail, more contrast and the graininess on the left hidden:
B:
http://www.pbase.com/gregbradley/image/124055594


Which do you prefer?

Greg.
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  #15  
Old 30-04-2010, 06:06 PM
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Greg,

When I see your two images side by side I prefer the latest repro as the contrast seems better however I was referring to your image compared to Peter's in my post. What I originally commented on re the detail in the nebulosity is present in both of your images.

Regards,

Peter
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  #16  
Old 30-04-2010, 06:25 PM
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wow Greg, both are awesome, jump right out. You could easily blend the 2 with masks in PS. In fact this image would well suit serious PS time with all the tools at hand to produce an absolute best-in-class cracker, with high contrast and all the extended nebulosity intact with no noise.
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  #17  
Old 30-04-2010, 06:48 PM
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Quote:
Originally Posted by gregbradley View Post
Well for comparison purposes here are the 2 versions:
Which do you prefer?Greg.
Fence sitting here...both...they are both stunning.
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  #18  
Old 30-04-2010, 08:16 PM
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Quote:
Originally Posted by Hagar View Post
Nice image Greg. What a whoppin big field of view. It fits it all plus a bit in. I just wonder if maybe you have stretched it a bit hard and lost a bit of the contrast. I hope you don't mind I had a little play to lift the contrast a little. If you dont like it I can remove it.
Now 2 versions. The stretched version I agree is pushing it. More exposure time once the moon is down before its totally gone for the year will help.

Quote:
Originally Posted by Paul Haese View Post
Nice Ha image Greg. Field is huge mate.
Gotta love this AP140 and its reducer. Not many scopes can handle that chip so well.

Quote:
Originally Posted by Dean View Post
Greg, Your image has a great "3D" look to it that the others dont seem to display. I like yours the best
Thanks Dean.

Quote:
Originally Posted by multiweb View Post
That version is superb! That's a massive square field. Real real good details in there.
Thanks Marc and thanks for the tip.

Quote:
Originally Posted by renormalised View Post
Huge FoV!!!....Great shot, Greg. Always love Ha shots
Ha has its appeal for sure.

Quote:
Originally Posted by peter_4059 View Post
It's an interesting comparison but I know which version I prefer - great image Greg.
Thanks pater.

Quote:
Originally Posted by peter_4059 View Post
Greg,

When I see your two images side by side I prefer the latest repro as the contrast seems better however I was referring to your image compared to Peter's in my post. What I originally commented on re the detail in the nebulosity is present in both of your images.

Regards,

Peter
Thanks Peter.

Quote:
Originally Posted by Bassnut View Post
wow Greg, both are awesome, jump right out. You could easily blend the 2 with masks in PS. In fact this image would well suit serious PS time with all the tools at hand to produce an absolute best-in-class cracker, with high contrast and all the extended nebulosity intact with no noise.
Thanks Fred. I'll shoot some more Ha before its gone for the year to build it up. I did take some more after I received the correct adapter but there was a reflection from where I ground down one adapter to fit my filter wheel. I need to blacken it.

Quote:
Originally Posted by wasyoungonce View Post
Fence sitting here...both...they are both stunning.
Thanks for that.
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