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Astro: Double Cluster
Here's another cluster photo. Image details are here on my website:
http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen |
#2
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Astro: Double Cluster
I tried a shot of this one a month ago at F/10. Even with only 2 minute
sub frames the RGB shots showed the main stars as so fully saturated they all came out white except for an orange halo around those that show an overall orange color in your shot. I gave up processing it as I just could get no color out of it. How do you prevent this at the much faster f ratio of the Epsilon? It would seem even harder to accomplish. Very short sub frames? Rick Jon Christensen wrote: Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#3
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Astro: Double Cluster
Beautiful
Kev "Jon Christensen" wrote in message ... Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen |
#4
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Astro: Double Cluster
Hi Rick,
My subframes were 10 minutes each binned 1x1. I really didn't do anything special. Did you bin your images? Jon "Rick Johnson" wrote in message ... I tried a shot of this one a month ago at F/10. Even with only 2 minute sub frames the RGB shots showed the main stars as so fully saturated they all came out white except for an orange halo around those that show an overall orange color in your shot. I gave up processing it as I just could get no color out of it. How do you prevent this at the much faster f ratio of the Epsilon? It would seem even harder to accomplish. Very short sub frames? Rick Jon Christensen wrote: Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen -- 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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Astro: Double Cluster
Thanks, Kev.
Jon Christensen "Kev" wrote in message ... Beautiful Kev "Jon Christensen" wrote in message ... Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen |
#6
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Astro: Double Cluster
Beautiful colours and a perfect field for those two.
I recently took a peek at the double cluster in my ETX70 scope (was too lazy to set up one of my larger scopes) and it was a breathtaking sight event with the small optics and city skies. Unfortunately I didn't manage to preserve star colours well when I imaged this object. Stefan "Jon Christensen" schrieb im Newsbeitrag ... Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen |
#7
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Astro: Double Cluster
Yes they were binned 2x2 as seeing rarely supports 1x1. Though that
would cut the exposure and maybe retain color better. I could always reduce them later. In 2 minutes any star of 11th magnitude or brighter was at an ADU of 60k which washes everything out for color. You are at just over 10" while I'm at 14" but I'd think the much shorter focal length would compress the stars to so few pixels (same camera) that you'd saturate even faster than I do. Maybe the binning has something to do with it. Tonight the clouds cleared and it was warm (0C). Temp has been fluctuating 30C lately. So I was all set for great imaging. Found the desiccant canister had worked loose with the temp change and I had a fogged window. 30 more minutes and I can take it out of the oven. I'd just done it a few months ago but apparently didn't tighten it down enough. SBIG says don't pinch the O ring so I didn't tighten it very hard but it was completely loose when I opened the camera. Same temp swings had tightened the center screw of the filter wheel so it wouldn't line up the lum frame correctly. Each time it would stop in a different place. So temp caused one to come loose the other to tighten too much. Things you have to learn switching from film to digital! Now the moon is up and clouds are coming back. I think I'll go back to getting "on" those clouds and snow. Typos can sure change the meaning sometimes! My ST-11000 shows a bloom when I bin at 3x3 and cool below -20C. At 2x2 it shows up at sensor temps below -35C so I hold the temp there rather than going lower. Don't know when it cuts in at 1x1. I was wondering if that may mean the gain setting of the camera is too high and might explain why you don't saturate and I do. It was a used camera but the previous owner claims not to have played with the gain setting that controls that bloom. Rick Jon Christensen wrote: Hi Rick, My subframes were 10 minutes each binned 1x1. I really didn't do anything special. Did you bin your images? Jon "Rick Johnson" wrote in message ... I tried a shot of this one a month ago at F/10. Even with only 2 minute sub frames the RGB shots showed the main stars as so fully saturated they all came out white except for an orange halo around those that show an overall orange color in your shot. I gave up processing it as I just could get no color out of it. How do you prevent this at the much faster f ratio of the Epsilon? It would seem even harder to accomplish. Very short sub frames? Rick Jon Christensen wrote: Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen -- 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". |
#8
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Astro: Double Cluster
I've been on a cloud or two in my lifetime. :-)
l just had a great dinner and a beer or two so I'm feeling good! I always bin 2x2 for the color except for this picture. The double cluster image was my first and only (except for one other lousy attempt) at shooting color with 1x1 binning. So if you cruise my website everything is shot with 2x2 binning in the color whether it's my 12 1/2 ritchey or my 8" Tak. The cores of the stars get saturated, but in the greyscale images the blue stars are bigger in diameter than the red stars and vice versa and the cores are saturated. But this difference in size makes the color. Regards, Jon "Rick Johnson" wrote in message ... Yes they were binned 2x2 as seeing rarely supports 1x1. Though that would cut the exposure and maybe retain color better. I could always reduce them later. In 2 minutes any star of 11th magnitude or brighter was at an ADU of 60k which washes everything out for color. You are at just over 10" while I'm at 14" but I'd think the much shorter focal length would compress the stars to so few pixels (same camera) that you'd saturate even faster than I do. Maybe the binning has something to do with it. Tonight the clouds cleared and it was warm (0C). Temp has been fluctuating 30C lately. So I was all set for great imaging. Found the desiccant canister had worked loose with the temp change and I had a fogged window. 30 more minutes and I can take it out of the oven. I'd just done it a few months ago but apparently didn't tighten it down enough. SBIG says don't pinch the O ring so I didn't tighten it very hard but it was completely loose when I opened the camera. Same temp swings had tightened the center screw of the filter wheel so it wouldn't line up the lum frame correctly. Each time it would stop in a different place. So temp caused one to come loose the other to tighten too much. Things you have to learn switching from film to digital! Now the moon is up and clouds are coming back. I think I'll go back to getting "on" those clouds and snow. Typos can sure change the meaning sometimes! My ST-11000 shows a bloom when I bin at 3x3 and cool below -20C. At 2x2 it shows up at sensor temps below -35C so I hold the temp there rather than going lower. Don't know when it cuts in at 1x1. I was wondering if that may mean the gain setting of the camera is too high and might explain why you don't saturate and I do. It was a used camera but the previous owner claims not to have played with the gain setting that controls that bloom. Rick Jon Christensen wrote: Hi Rick, My subframes were 10 minutes each binned 1x1. I really didn't do anything special. Did you bin your images? Jon "Rick Johnson" wrote in message ... I tried a shot of this one a month ago at F/10. Even with only 2 minute sub frames the RGB shots showed the main stars as so fully saturated they all came out white except for an orange halo around those that show an overall orange color in your shot. I gave up processing it as I just could get no color out of it. How do you prevent this at the much faster f ratio of the Epsilon? It would seem even harder to accomplish. Very short sub frames? Rick Jon Christensen wrote: Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen -- 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". |
#9
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Astro: Double Cluster
That's something I hadn't thought about. I figured when a 2x2 binning
was blown up to the size of the 1x1 lum image the stars would be about the same size. Should have tried it. Thanks for the info. Rick Jon Christensen wrote: I've been on a cloud or two in my lifetime. :-) l just had a great dinner and a beer or two so I'm feeling good! I always bin 2x2 for the color except for this picture. The double cluster image was my first and only (except for one other lousy attempt) at shooting color with 1x1 binning. So if you cruise my website everything is shot with 2x2 binning in the color whether it's my 12 1/2 ritchey or my 8" Tak. The cores of the stars get saturated, but in the greyscale images the blue stars are bigger in diameter than the red stars and vice versa and the cores are saturated. But this difference in size makes the color. Regards, Jon "Rick Johnson" wrote in message ... Yes they were binned 2x2 as seeing rarely supports 1x1. Though that would cut the exposure and maybe retain color better. I could always reduce them later. In 2 minutes any star of 11th magnitude or brighter was at an ADU of 60k which washes everything out for color. You are at just over 10" while I'm at 14" but I'd think the much shorter focal length would compress the stars to so few pixels (same camera) that you'd saturate even faster than I do. Maybe the binning has something to do with it. Tonight the clouds cleared and it was warm (0C). Temp has been fluctuating 30C lately. So I was all set for great imaging. Found the desiccant canister had worked loose with the temp change and I had a fogged window. 30 more minutes and I can take it out of the oven. I'd just done it a few months ago but apparently didn't tighten it down enough. SBIG says don't pinch the O ring so I didn't tighten it very hard but it was completely loose when I opened the camera. Same temp swings had tightened the center screw of the filter wheel so it wouldn't line up the lum frame correctly. Each time it would stop in a different place. So temp caused one to come loose the other to tighten too much. Things you have to learn switching from film to digital! Now the moon is up and clouds are coming back. I think I'll go back to getting "on" those clouds and snow. Typos can sure change the meaning sometimes! My ST-11000 shows a bloom when I bin at 3x3 and cool below -20C. At 2x2 it shows up at sensor temps below -35C so I hold the temp there rather than going lower. Don't know when it cuts in at 1x1. I was wondering if that may mean the gain setting of the camera is too high and might explain why you don't saturate and I do. It was a used camera but the previous owner claims not to have played with the gain setting that controls that bloom. Rick Jon Christensen wrote: Hi Rick, My subframes were 10 minutes each binned 1x1. I really didn't do anything special. Did you bin your images? Jon "Rick Johnson" wrote in message ... I tried a shot of this one a month ago at F/10. Even with only 2 minute sub frames the RGB shots showed the main stars as so fully saturated they all came out white except for an orange halo around those that show an overall orange color in your shot. I gave up processing it as I just could get no color out of it. How do you prevent this at the much faster f ratio of the Epsilon? It would seem even harder to accomplish. Very short sub frames? Rick Jon Christensen wrote: Here's another cluster photo. Image details are here on my website: http://www.christensenastroimages.co...ngc869-884.htm Have a great weekend! Jon Christensen -- 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". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#10
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Astro: Double Cluster
"Jon Christensen" wrote
Jon, Beautiful picture of a great subject! I always end up observing this object when ever it's up. George N |
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