Attached is an image of the eastern loop of the Veil Nebula (NGC 6992, Caldwell 33) in Cygnus. The Veil Nebula is a vast cloud of heated ionised gas and dust formed from a supernova remnant which exploded between 10 and 20 thousand years ago. The whole supernova remnant (of which this is just a part) measures about 3 degrees of sky (or roughly 6 Moon diameters). I’ve previously imaged this part of the nebula using my Tak 85 telescope which gives a wider field of view. For this image I used my Televue NP101is 4 inch refractor telescope which gives more of a close-up view. This image consists of the following 300s sub-exposures: Lx68, Rx41, Gx40, Bx51 all unbinned and Hax54 binned x2 giving a total imaging time of 21 hours and 10 minutes over 8 nights between 27th August and 8th September 2021. I used a Paramount MX mount, a QSI 690 CCD camera and Lodestar 2 guide camera. Image capture was done with Maxim DL and I used CCD Stack2, Photoshop CS5 and Topaz Denoise AI for further processing. Thanks for looking.
Tim C
Attached is an image of the eastern loop of the Veil Nebula (NGC 6992, Caldwell 33) in Cygnus. The Veil Nebula is a vast cloud of heated ionised gas and dust formed from a supernova remnant which exploded between 10 and 20 thousand years ago. The whole supernova remnant (of which this is just a part) measures about 3 degrees of sky (or roughly 6 Moon diameters). I’ve previously imaged this part of the nebula using my Tak 85 telescope which gives a wider field of view. For this image I used my Televue NP101is 4 inch refractor telescope which gives more of a close-up view. This image consists of the following 300s sub-exposures: Lx68, Rx41, Gx40, Bx51 all unbinned and Hax54 binned x2 giving a total imaging time of 21 hours and 10 minutes over 8 nights between 27th August and 8th September 2021. I used a Paramount MX mount, a QSI 690 CCD camera and Lodestar 2 guide camera. Image capture was done with Maxim DL and I used CCD Stack2, Photoshop CS5 and Topaz Denoise AI for further processing. Thanks for looking.
Tim C
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<NGC 6992 Eastern Veil Nebula BB NP101 QSI690 October 2021.jpg>
On 28 Oct 2021, at 08:42, 'JR' via croydonastro <croydo...@googlegroups.com> wrote:
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Attached is an image of the eastern loop of the Veil Nebula (NGC 6992, Caldwell 33) in Cygnus. The Veil Nebula is a vast cloud of heated ionised gas and dust formed from a supernova remnant which exploded between 10 and 20 thousand years ago. The whole supernova remnant (of which this is just a part) measures about 3 degrees of sky (or roughly 6 Moon diameters). I’ve previously imaged this part of the nebula using my Tak 85 telescope which gives a wider field of view. For this image I used my Televue NP101is 4 inch refractor telescope which gives more of a close-up view. This image consists of the following 300s sub-exposures: Lx68, Rx41, Gx40, Bx51 all unbinned and Hax54 binned x2 giving a total imaging time of 21 hours and 10 minutes over 8 nights between 27th August and 8th September 2021. I used a Paramount MX mount, a QSI 690 CCD camera and Lodestar 2 guide camera. Image capture was done with Maxim DL and I used CCD Stack2, Photoshop CS5 and Topaz Denoise AI for further processing. Thanks for looking.
Tim C
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Hi William and Trev. Many thanks for your comments – much appreciated. @William you are very close with your estimate of the FOV with this set up. Re the stars, I did do some star reduction but only as much as needed to place them in the background and not overwhelm the nebula. Stars are relatively bright and nebulas are dim and this is a composition after all, so I wanted the nebula to stand out to increase the 3D depth of field effect.
Re guiding, I use Maxim DL for both image capture with the main CCD camera and guiding through the guide camera. Both main CCD cameras I use (QSI 690 and Moravian G2 8300) have off-axis guider ports and the Lodestar 2 guide camera simply screws into the ports. I find this setup generally very reliable. Re Topaz De Noise, I only recently acquired this software, but first impressions are that it does an excellent job particularly on de-noising wispy cloudy features like nebulas. This helps to improve image quality and bring out features that were ‘hidden’ by noise. It is also easy to use and I have it set up as a plug-in for Photoshop CS5. A very useful tool in my opinion. Hope all this is helpful.
Tim C
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