User Links for
 nheacock







CURRENT MOON
(North America)
History
209 Entries
08/21/17
09/13/15
08/16/15
07/18/15
06/14/15
05/28/15
06/17/12
06/05/12
05/18/12
05/15/12
05/13/12
05/12/12
05/11/12
08/31/11
07/01/11
06/24/11
06/01/11
04/29/11
04/22/11
04/19/11
04/18/11
03/28/11
03/27/11
03/22/11
03/14/11
02/25/11
02/17/11
02/08/11
02/01/11
01/31/11
01/02/11
12/30/10
10/13/10
09/12/10
08/28/10
08/15/10
07/17/10
07/11/10
07/07/10
06/14/10
06/07/10
05/20/10
04/24/10
04/10/10
03/22/10
03/18/10
03/15/10
03/05/10
02/21/10
02/09/10
01/13/10
12/14/09
12/09/09
12/08/09
• 12/05/09
12/01/09
11/24/09
11/01/09
09/24/09
09/19/09
09/01/09
08/30/09
08/22/09
08/15/09
08/12/09
07/25/09
07/22/09
07/21/09
07/02/09
07/01/09
06/29/09
06/22/09
06/15/09
05/22/09
05/21/09
05/20/09
05/07/09
04/30/09
04/24/09
04/20/09
03/29/09
03/27/09
03/26/09
03/06/09
02/28/09
02/15/09
01/19/09
09/27/08
09/25/08
09/22/08
08/27/08
08/03/08
07/25/08
07/24/08
07/11/08
07/07/08
07/06/08
07/04/08
07/02/08
06/27/08
06/24/08
06/12/08
05/03/08
04/30/08
04/11/08
03/24/08
03/05/08
02/21/08
02/17/08
02/16/08
01/15/08
11/06/07
09/11/07
08/28/07
08/18/07
07/26/07
07/13/07
07/10/07
07/09/07
06/15/07
05/14/07
05/10/07
05/07/07
04/22/07
04/15/07
03/16/07
12/17/06
12/02/06
08/27/06
07/23/06
07/20/06
07/19/06
07/16/06
06/23/06
06/13/06
06/10/06
05/22/06
05/02/06
04/28/06
04/23/06
04/01/06
03/11/06
02/12/06
01/25/06
11/09/05
11/08/05
10/27/05
09/27/05
09/12/05
08/01/05
07/29/05
07/25/05
07/24/05
07/18/05
07/14/05
07/09/05
07/04/05
06/26/05
06/18/05
05/06/05
03/12/05
03/11/05
01/10/05
01/02/05
12/30/04
12/06/04
11/03/04
11/01/04
09/22/04
09/21/04
09/10/04
09/06/04
09/05/04
08/13/04
08/08/04
08/07/04
08/06/04
08/03/04
07/20/04
07/12/04
07/10/04
07/08/04
07/06/04
07/05/04
06/28/04
06/22/04
06/19/04
06/18/04
06/16/04
06/15/04
06/14/04
05/31/04
05/23/04
05/14/04
05/09/04
05/08/04
04/30/04
04/25/04
04/23/04
04/22/04
04/21/04
04/19/04
04/09/04
04/01/04
03/30/04
03/29/04
03/08/04
03/02/04
02/24/04
    
Saturday, December 5th, 2009
My Second HaRGB Blend

My objective is to shoot Ha shots during bright lunar phases and blend them with RGB shots taken during new moon nights.

This is only the second time I've done it, so I'm still getting the hang of it. But I think this turned out pretty decent.

The Soul Nebula IC 1848 Image in HaRGB
This is a combined HaRGB shot with 3 hours of RGB data and 3 hours 40 minutes of Ha data. One of the differences between this one and the last one (NGC 281) is that both shots were taken at my house.

Scope: William Optics ZenithStar 66 SD @ f/4.7 w/WO 0.8x Flat II Reducer
Mount: Orion Sirius EQ-G with GoTo
Guiding:  Meade DSI Pro and PHD Guiding
Guide Scope: Vixen R200SS 200mm
Camera: Canon EOS 1000D (modified) w/Astronomik 12nm Ha Clip In Filter
Special Settings: None
ISO: 1600
Exposure: Ha 3 hours 40 minutes - (11 x 1200s) & RGB 3 hours - (36 x 300s)
Processing Software: Acquired in Nebulosity with Extreme dithering, Stacked in Deep Sky Stacker (Kappa-Sigma Median Clipping for all frames), Levels, Curves, Astronomy Tools, Gradient XTerminator and Noise Ninja in Photoshop
Support Files: 50 flats, 50 bias, 12 darks
See Gallery below for image

The Flaming Star IC 405 Image in HaRGB
This is a combined HaRGB shot with 1.5 hours of RGB data and 2 hours of Ha data. This is the first image that had both the Ha and RGB data shot through the 1000D. I wanted to get more time on it, but tonight was not a good night time-wise. Too bad too because it was an excellent night overall.

Scope: William Optics ZenithStar 66 SD @ f/4.7 w/WO 0.8x Flat II Reducer
Mount: Orion Sirius EQ-G with GoTo
Guiding:  Meade DSI Pro and PHD Guiding
Guide Scope: Vixen R200SS 200mm
Camera: Canon EOS 1000D (modified) w/Astronomik 12nm Ha Clip In Filter
Special Settings: None
ISO: 1600
Exposure: Ha 2 hours - (6 x 1200s) & RGB 1 hour 30 minutes - (30 x 180s)
Processing Software: Acquired in Nebulosity with Extreme dithering, Stacked in Deep Sky Stacker (Kappa-Sigma Median Clipping for all frames), Levels, Curves, Astronomy Tools, Gradient XTerminator and Noise Ninja in Photoshop
Support Files: 50 flats, 50 bias, 12 darks
See Gallery below for image



Image Gallery For This Session
01 IC1848 6h 40m HaRGB 02 IC405 3h 30m HaRGB
   

01-IC1848-6h-40m-HaRGB.jpg
Click picture above for larger version
If the picture seems too bright or too dark, try adjusting the brightness below.
Brightness:
|
  



Comments:
On 12/09/09 at 12:40am Neil Heacock wrote:
@Barry: I have more coming... NGC1499 (California) in HaRGB, and NGC 2237 (Rosette) in at least Ha if not HaRGB as well. I'm working on those tonight.

Without a modded cam, I haven't been able to shoot big red nebulae, so I'm a little hooked on them right now!

@Dave: Heh... I'm still at the foot of the mountain looking waaaaay up at the big boys. But I'm climbing as fast as I can! Maybe one of these day's I'll have a picture on Nasa's APOD.

-Neil


On 12/08/09 at 04:54pm Barry wrote:
Flaming Star: Another very fine image. These large red nebulas are not my personal cup of tea photographically, but you really have done a superb job with them.

On 12/08/09 at 02:51pm dave wrote:
3 clicks brighter and it looks great...
That mountain did not take long to climb...now what ?!!

On 12/07/09 at 02:12am Neil Heacock wrote:
Thank you Barr.

Dithering is the process of moving the scope a few pixels little each frame so that the hot pixels of the camera or the pattern of the pattern noise inherent in every camera (that is, the bias) doesn't fall in the same place every frame. Nebulosity in conjunction with PHD has an option to perform a dither step between frames. I find it helpful for smoothing my images, so I use it.

Regarding an explanation of sigma clipping, I suggest you peruse the Deep Sky Stacker wiki (and maybe even print out to have it in front of you while you're working in DSS). The url is here:
http://deepskystacker.wikispaces.com/

It's a phenomenal resource. Since the person who does alot of the entries (maybe all of them?) is Sander Pool many of the entries are written using a QHY8, but the principles are the same for DSLR users.

-Neil

On 12/07/09 at 01:41am Barry wrote:
Very nice, Neil. You will have to explain the 'dithering' and the 'sigma clipping' for us boneheads. (I use plural, but I only include myself....enough boneheadedness for several people.)



Add A Comment:
Your Name (optional):

*Your Comment:



CAPTCHA Image   Reload Image
Enter Code*:


NOTE: Comments are moderated and do not post immediately.



© 2008 Triad Technology Systems | www.triadtechsys.com