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#1
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ASTRO: NGC 2244 (Rosette nebula)
I recently used a night with exceptionally good transparency to image the
Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan |
#3
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ASTRO: NGC 2244 (Rosette nebula)
I like that one!
I don't have anything but the 3556 mm focal length so I'd need a few dozen shots to get this one. In fact I have one on the hard drive but it didn't look worth processing, just fuzz with a dark lane in it. When the budget allows I'll have to get a good wide angle scope to put atop the LX200R. I had the rings made so I can attach something up there easily. The one kid still in College reports his computer died today and is beyond fixing. There goes the budget for such a scope for now. Rick Stefan Lilge wrote: I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#4
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ASTRO: NGC 2244 (Rosette nebula)
Just noticed something. The Drizzle link goes to a larger image than
the non drizzle link yet you say the drizzle one has been reduced. Are they mislabeled? The posted image is the smaller one. Rick Stefan Lilge wrote: I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#5
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modified drizzle: ASTRO: NGC 2244 (Rosette nebula)
nice shot of a nice target Stefan. It is a lot of fun putting a proper ccd
camera on a camera lens. The wideangle views are a lot of fun, even though they are at low resolution. It is good enough to see the large scale structure. The only difficulty I have is that the focusing can be challenging because the stars are all so small to begin with! --- I have been experimenting with a modified "drizzle" method myself the DM has 24x24 micron pixels, 1K x 1K total. It gets great signal to noise: it has very high QE and it gathers a lot of signal with the big pixels. The trouble is that the resolution is low for the area covered I have been expanding the calibrated images to 4K x 4K before aligning and stacking. I think that when you are undersampled but dithered, when you stack enough images that are arbitrarily dithered and with bicubic and other such resampling routines based on the centroids of the stars, that you can effectively enhance resolution by stacking many such processed images. The vdB142 image was so processed. After my stacking and initial adjustments, I downsize to 2K x 2K for an effective 4Mpixels. So the method is: 1) calibrate 2) upsize 4x4 3) register 4) stack 5) stretch, and process normally etc 6) downsize 2x2 7) finish I need to do a more rigorous study as I am just beginning this set of experiments. Preliminary results seem pretty nice but I will be the first to admit I haven't made any serious attempt to do a controlled experiment "Stefan Lilge" wrote in message ... I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan |
#6
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ASTRO: NGC 2244 (Rosette nebula)
Rick,
the drizzle process involves an increase of image size to 2x the original size, so the "drizzled" version is the larger one even after a reduction to 75%. Stefan "Rick Johnson" schrieb im Newsbeitrag ... Just noticed something. The Drizzle link goes to a larger image than the non drizzle link yet you say the drizzle one has been reduced. Are they mislabeled? The posted image is the smaller one. Rick Stefan Lilge wrote: I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#7
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ASTRO: NGC 2244 (Rosette nebula)
Thanks Fabio.
I have a 1,25 inch filter which threads into a metal ring that can be put into the M42 adaptor that connects the SXV-H9 with the M42 lens. I don't remember where I got it from though. Stefan "Fabio" schrieb im Newsbeitrag ... Very amazing picture!!! You are encouraging me, i want to use a Sigma 150mm f2.8 using the SXVF-H9C for the Rosette. I think that the FOV should be a little more than yours having a less dimension of the nebula. But still interesting. How have you connected the H alfa filter to the staff ??? Thank you for the post. Regards -- -- Fabio Acquarone Website: http://www.fabioh2o.it Email : "Stefan Lilge" ha scritto nel messaggio ... I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan |
#8
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ASTRO: NGC 2244 (Rosette nebula)
Thanks Stefan..
-- -- Fabio Acquarone Website: http://digilander.libero.it/fabioh2o Email : "Stefan Lilge" ha scritto nel messaggio ... Thanks Fabio. I have a 1,25 inch filter which threads into a metal ring that can be put into the M42 adaptor that connects the SXV-H9 with the M42 lens. I don't remember where I got it from though. Stefan "Fabio" schrieb im Newsbeitrag ... Very amazing picture!!! You are encouraging me, i want to use a Sigma 150mm f2.8 using the SXVF-H9C for the Rosette. I think that the FOV should be a little more than yours having a less dimension of the nebula. But still interesting. How have you connected the H alfa filter to the staff ??? Thank you for the post. Regards -- -- Fabio Acquarone Website: http://www.fabioh2o.it Email : "Stefan Lilge" ha scritto nel messaggio ... I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan |
#9
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ASTRO: NGC 2244 (Rosette nebula)
A stunning image Stefan. Clear Skyz, LA
"Stefan Lilge" wrote in message ... I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan |
#10
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ASTRO: NGC 2244 (Rosette nebula)
Thanks for the explanation. Not having used Drizzle I wasn't all that
familiar with it. I just posted my partial shot of this nebula. Came out far better than I thought it would. Rick Stefan Lilge wrote: Rick, the drizzle process involves an increase of image size to 2x the original size, so the "drizzled" version is the larger one even after a reduction to 75%. Stefan "Rick Johnson" schrieb im Newsbeitrag ... Just noticed something. The Drizzle link goes to a larger image than the non drizzle link yet you say the drizzle one has been reduced. Are they mislabeled? The posted image is the smaller one. Rick Stefan Lilge wrote: I recently used a night with exceptionally good transparency to image the Rosette nebula. My only previous attempts on this object were done with my Canon EOS300D DSLR camera and some closeups with small CCD chips that only got a small part of the nebula. This time I used a 200mm f/3.5 lens and was quite surprised how bright this object is when imaged with a "proper" CCD camera as it was tough with the DSLR. I will attach a "normal" version and a link to one where I used "drizzle processing" in IRIS. The drizzled version shows more detail, but is also noisier, so I reduced it's size (which was 2x original size) to 75% which helped a bit. Unfortunately I lost one hour of data when the nebula was in it's best position. Taken from the middle of Berlin with a 200mm f/3.5 lens, SXV-H9 camera, AStronomik 13nm Halpha filter, 30x5 minutes. The images can also be found at http://www.slilge.de/temp/2244-30x5gut.jpg http://www.slilge.de/temp/2244-drizzle30x5gut.jpg Stefan ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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