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Post by Dragon Man on Aug 12, 2017 15:07:28 GMT
Please post your images here for September - Globular Cluster Month It can be any Globular Cluster but must be captured this month: September 2017. See Rules - HEREDon't forget to include: (you can copy paste this list) Camera - Telescope - Mount - Focal Reducer/Barlow - Filters - Exposure length - Stacks - Software - Settings (Gain 60%, high saturation, etc) - Any Processing (on-the-fly, post-processing) - Conditions (80% Moon, windy, bad light pollution, etc) - General Location (Town or area & State & Country) -
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Post by Dragon Man on Aug 31, 2017 16:15:21 GMT
Open for posting
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 11, 2017 13:46:13 GMT
NGC 7492 is a 11th magnitude Globular Cluster appearing in the constellation Aquarius. It is 86 thousand light years from our solar system. Its a very unvisited and difficult object for me because the sky-glow of the near sea blurs the image at high exposition. And this is a very faint object. Camera - RisingTech IMX244 fan-cooled Telescope - Skywatcher 200/800 Mount -NEQ5 Focal Reducer/Barlow - NO Filters - NO Exposure length - 15" Stacks - 10 Software - Risingsky Settings (Gain 60%, high saturation, etc) - Gain max. The rest as default Any Processing (on-the-fly, post-processing) - Levels, Contrast, Unsharpen Mask and Curves with GIMP Conditions (80% Moon, windy, bad light pollution, etc) - Moon= 0%. Skyglow because low altitude.
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Post by Dragon Man on Sept 12, 2017 7:03:29 GMT
WOW!!! that certainly is a faint Glob! Well done Carlos
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Post by Deleted on Sept 15, 2017 6:32:11 GMT
M2 NGC7089 Camera - GStar Ex3 Telescope - ED80/600 Mount - HEQ5 Focal Reducer/Barlow - NA Filters - UV/IR cut Exposure length - 30s Stacks - 0 Software - Altair Capture Settings Gain 6% Any Processing - Auto Dark Subtraction - Conditions No moon, blowing a bloody gale! General Location - Esk QLD
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 15, 2017 6:45:11 GMT
Hey, I have one of this camera, it seems pretty cool. Very nice picture What advantages do you find in using low gain? I use to use always max. with shorter expositions. This is an image of the same object taken with an expo of 10x5" with gain at max. for comparison.
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Post by Dragon Man on Sept 15, 2017 8:55:22 GMT
Both images look about the same detail. Though a bit hard to tell with Roberts image so small. Robert - single 30 second frame = 30 seconds Carlos - 10 x 5 second frames = 50 seconds Both very nice results
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Post by ChrisV on Sept 15, 2017 23:44:06 GMT
Nice shots guys.
Low gain is less noise. But for short total exposures I don't think it will make much difference with our stuff.
I suppose the only thing might be that you are less likely to saturate stars at lower gain with the larger well size - as long as you done increase exposure time too much. So could potentially see more star colours at low gain ? But Carlos has used much shorter sub exposures so that should balance out the amount of saturation at least a bit
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elpajare
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Post by elpajare on Sept 16, 2017 7:27:07 GMT
Agree wit you Chris. This chip, specially, has very low noise and I think that this allow the use of high gain to improve at max. sensibility. Exposures between 1" and 30" they do not produce visible and annoying noise. At least I do not see in photos. This is for EAA...for astrophoto this is another world. Regarding to the color of stars refractors are very best than reflectors in my opinion. This a picture of M 34 taken at 10x4" with the Bresser. NO FILTERS. Gain= MAX There are very nice colors here with short expo. and high Gain. Sharp stars also. But everything can be improved, I'm doing tests with the camera and the telescope.
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Post by ChrisV on Sept 17, 2017 1:50:24 GMT
That's brilliant Carlos, some great colour in there
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Post by ChrisV on Sept 17, 2017 1:57:53 GMT
Here's two different takes on NGC288 Both with telescope - WO 90mm refractor 80/478 Mount -CGEM Filters - NO Conditions (80% Moon, windy, bad light pollution, etc) - Moon= 0%. But the sky was grey, yuck. The first with Camera - ASI224MC Focal Reducer/Barlow - ~ x0.8 Exposure length - 15" Stacks - 10 Software - sharpcap Settings - gain 300 Any Processing (on-the-fly, post-processing) - live stacked (post- converted png to jpg) After I did the 224 shot skysafari said I could also fit in NGC253 with the larger ASI071 camera. This is a screen shot astrotoaster Camera - ASI071MC at -5C Focal Reducer/Barlow - no Exposure length - 30" Stacks - 8 Software - sharpcap & astrotoaster Settings - gain 300, bin x2 in sharpcap Any Processing (on-the-fly, post-processing) - live flat corrected and stacked in astrotoaster (post- converted png to jpg)
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Post by Deleted on Sept 17, 2017 5:50:16 GMT
Hey, I have one of this camera, it seems pretty cool. Very nice picture What advantages do you find in using low gain? I use to use always max. with shorter expositions. This is an image of the same object taken with an expo of 10x5" with gain at max. for comparison. Thanks. This was the first time I have used the snipping tool. I think it looked prettier (larger) in the snapshot. I don't think there is any advantage in low gain if you are going to use live stack. I find that fussing with a computer detracts from my observing pleasure so I try to set up exposure parameters that I can use for everything - just some small adjustment to gain and histogram between objects. Sometimes i set exposure to 30s and sometimes 20s and I set the gain so as to get a reasonably clean image without stacking. My gut feeling is that a small amount of gain ~5% can give you a better image than 0 gain. As objects become fainter, gain goes up and eventually I have to stack.
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 17, 2017 7:38:12 GMT
OK Robert, I understand you. Two different ways to arrive at same results.
I do this by setting the gain to the maximum and then adjusting the exposure. It seems to me that with the high gain you get more weak stars, but your results are very good.
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elpajare
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Posts: 438
home town/country: Girona-Spain
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Post by elpajare on Sept 17, 2017 7:44:03 GMT
Here's two different takes on NGC288 Both with telescope - WO 90mm refractor 80/478 Mount -CGEM Filters - NO Conditions (80% Moon, windy, bad light pollution, etc) - Moon= 0%. But the sky was grey, yuck. The first with Camera - ASI224MC Focal Reducer/Barlow - ~ x0.8 Exposure length - 15" Stacks - 10 Software - sharpcap Settings - gain 300 Any Processing (on-the-fly, post-processing) - live stacked (post- converted png to jpg) After I did the 224 shot skysafari said I could also fit in NGC253 with the larger ASI071 camera. This is a screen shot astrotoaster Camera - ASI071MC at -5C Focal Reducer/Barlow - no Exposure length - 30" Stacks - 8 Software - sharpcap & astrotoaster Settings - gain 300, bin x2 in sharpcap Any Processing (on-the-fly, post-processing) - live flat corrected and stacked in astrotoaster (post- converted png to jpg) Very good shots Chris. The IMX224 has a yellowish color as usual but the IMX071 is a very good one. Clear picture, high detail and more realistic colors. but..... what price more expensive!!
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Post by Dragon Man on Sept 17, 2017 9:20:50 GMT
Here's two different takes on NGC288 Conditions ( 80% Moon, windy, bad light pollution, etc) - Moon= 0%. But the sky was grey, yuck. So which one was it Chris? 80% or 0%?
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Post by ChrisV on Sept 17, 2017 23:45:43 GMT
Oops. Usually cut and paste error ... It was probably 0% (or 80%).
The colour difference. With the 224 I tried to set colour in sharpcap but stuffed it up. With the 071 I save fits files and they get processed in astrotoaster which gives more sensible colour balance.
Yes the 071 is more expensive. I'm also using it for astrophotography - the size and cooling are great for that. At least, that's how I justified it to myself...
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Post by Deleted on Sept 20, 2017 1:25:01 GMT
OK Robert, I understand you. Two different ways to arrive at same results. I do this by setting the gain to the maximum and then adjusting the exposure. It seems to me that with the high gain you get more weak stars, but your results are very good. I'll try your method next time I'm out
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elpajare
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Post by elpajare on Sept 20, 2017 15:19:42 GMT
Another of globulars are almost out of my FOV. This is with 2" expo. I can see some color in the stars. M 2 is about 37,500 light years distant, and lies well beyond the Galactic Center It is about 175 light-years in diameter, and contains about 150,000 stars. Camera - RisingTech IMX244 fan-cooled Telescope - Skywatcher 200/800 Mount -NEQ5 Focal Reducer/Barlow - NO Filters - NO Exposure length - 2" Stacks - 10 Software - Risingsky Settings (Gain, high saturation, etc) - Gain max. The rest as default Any Processing (on-the-fly, post-processing) - Levels, Contrast and Curves with GIMP
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